# No. 399 (Brown 1868): "A method of repairing chains, or tightening chains used as guys or braces. Link is made in two parts, one end of each is provided
# with swivel-nut, and other end with screw; the screw of each part fits into nut of other."
#
# Model (cm, Brown's view, the link hanging in its chain: gravity on). The upper half (held by the chain above) has a swivel nut on its left leg and a screw
# (right hand, pitch 1.6, as No. 102's) on its right; the lower half the other way about: a screw on its left leg, a swivel nut on its right. Each nut is an
# oblong frame whose one end turns on its leg's knob (the swivel) and whose other end is tapped for the other half's screw. The left nut is turned by a
# spanner (-12 rpm, the one driven joint): its thread draws the lower half's screw up into it, a pitch a turn, and the lower half rises; the right
# nut, free on its swivel, is turned by the right screw's thread as the lower half rises (the threads are not self-locking). Only the threads touch;
# the lower half hangs from them by its weight. Generator: opencode-runs/batch13/gen399.py.
number: 399
slug: chain-repair-link
name: Repairing or tightening a chain
brown: "A method of repairing chains, or tightening chains used as guys or braces. Link is made in two parts, one end of each is provided with swivel-nut, and other end with screw; the screw of each part fits into nut of other."
units: cm
sim:
  timestep: 0.0002
  integrator: implicitfast
  iterations: 100
  solver: CG
  multiccd: true
  duration_s: 10
  floor: false
bodies:
  - id: upper
    shape: part
    pos: [0, 0, 0]
    fixed: true
    friction: 0.1
    color: "#9a948a"
    pieces:
      - {kind: rod, from: [-6.5, 0.0, 13.0], to: [-6.2785, 0.0, 14.6823], radius: 1.2}
      - {kind: rod, from: [-6.2785, 0.0, 14.6823], to: [-5.6292, 0.0, 16.25], radius: 1.2}
      - {kind: rod, from: [-5.6292, 0.0, 16.25], to: [-4.5962, 0.0, 17.5962], radius: 1.2}
      - {kind: rod, from: [-4.5962, 0.0, 17.5962], to: [-3.25, 0.0, 18.6292], radius: 1.2}
      - {kind: rod, from: [-3.25, 0.0, 18.6292], to: [-1.6823, 0.0, 19.2785], radius: 1.2}
      - {kind: rod, from: [-1.6823, 0.0, 19.2785], to: [-0.0, 0.0, 19.5], radius: 1.2}
      - {kind: rod, from: [-0.0, 0.0, 19.5], to: [1.6823, 0.0, 19.2785], radius: 1.2}
      - {kind: rod, from: [1.6823, 0.0, 19.2785], to: [3.25, 0.0, 18.6292], radius: 1.2}
      - {kind: rod, from: [3.25, 0.0, 18.6292], to: [4.5962, 0.0, 17.5962], radius: 1.2}
      - {kind: rod, from: [4.5962, 0.0, 17.5962], to: [5.6292, 0.0, 16.25], radius: 1.2}
      - {kind: rod, from: [5.6292, 0.0, 16.25], to: [6.2785, 0.0, 14.6823], radius: 1.2}
      - {kind: rod, from: [6.2785, 0.0, 14.6823], to: [6.5, 0.0, 13.0], radius: 1.2}
      - {kind: rod, from: [-6.5, 0, 13.0], to: [-6.5, 0, 9.3], radius: 1.2}   # the left leg
      - {kind: rod, from: [-6.5, 0, 9.3], to: [-6.5, 0, 5.2], radius: 0.7}   # its swivel neck
      - {kind: disc, center: [-6.5, 0], radius: 1.4, y: [-1.4, 1.4]}
      - {kind: rod, from: [6.5, 0, 13.0], to: [6.5, 0, 11.0], radius: 1.2}   # the right leg
      - {kind: rod, from: [6.5, 0, 11.0], to: [6.5, 0, 0.8], radius: 1.0}   # its screw's core
      - {kind: loft, a: [[7.45, 0.0, 0.525], [7.45, 0.0, 1.475], [8.1, 0.0, 1.15], [8.1, 0.0, 0.85]], b: [[7.4176, 0.2459, 0.5917], [7.4176, 0.2459, 1.5417], [8.0455, 0.4141, 1.2167], [8.0455, 0.4141, 0.9167]], collide: 1}
      - {kind: loft, a: [[7.4176, 0.2459, 0.5917], [7.4176, 0.2459, 1.5417], [8.0455, 0.4141, 1.2167], [8.0455, 0.4141, 0.9167]], b: [[7.3227, 0.475, 0.6583], [7.3227, 0.475, 1.6083], [7.8856, 0.8, 1.2833], [7.8856, 0.8, 0.9833]], collide: 1}
      - {kind: loft, a: [[7.3227, 0.475, 0.6583], [7.3227, 0.475, 1.6083], [7.8856, 0.8, 1.2833], [7.8856, 0.8, 0.9833]], b: [[7.1718, 0.6718, 0.725], [7.1718, 0.6718, 1.675], [7.6314, 1.1314, 1.35], [7.6314, 1.1314, 1.05]], collide: 1}
      - {kind: loft, a: [[7.1718, 0.6718, 0.725], [7.1718, 0.6718, 1.675], [7.6314, 1.1314, 1.35], [7.6314, 1.1314, 1.05]], b: [[6.975, 0.8227, 0.7917], [6.975, 0.8227, 1.7417], [7.3, 1.3856, 1.4167], [7.3, 1.3856, 1.1167]], collide: 1}
      - {kind: loft, a: [[6.975, 0.8227, 0.7917], [6.975, 0.8227, 1.7417], [7.3, 1.3856, 1.4167], [7.3, 1.3856, 1.1167]], b: [[6.7459, 0.9176, 0.8583], [6.7459, 0.9176, 1.8083], [6.9141, 1.5455, 1.4833], [6.9141, 1.5455, 1.1833]], collide: 1}
      - {kind: loft, a: [[6.7459, 0.9176, 0.8583], [6.7459, 0.9176, 1.8083], [6.9141, 1.5455, 1.4833], [6.9141, 1.5455, 1.1833]], b: [[6.5, 0.95, 0.925], [6.5, 0.95, 1.875], [6.5, 1.6, 1.55], [6.5, 1.6, 1.25]], collide: 1}
      - {kind: loft, a: [[6.5, 0.95, 0.925], [6.5, 0.95, 1.875], [6.5, 1.6, 1.55], [6.5, 1.6, 1.25]], b: [[6.2541, 0.9176, 0.9917], [6.2541, 0.9176, 1.9417], [6.0859, 1.5455, 1.6167], [6.0859, 1.5455, 1.3167]], collide: 1}
      - {kind: loft, a: [[6.2541, 0.9176, 0.9917], [6.2541, 0.9176, 1.9417], [6.0859, 1.5455, 1.6167], [6.0859, 1.5455, 1.3167]], b: [[6.025, 0.8227, 1.0583], [6.025, 0.8227, 2.0083], [5.7, 1.3856, 1.6833], [5.7, 1.3856, 1.3833]], collide: 1}
      - {kind: loft, a: [[6.025, 0.8227, 1.0583], [6.025, 0.8227, 2.0083], [5.7, 1.3856, 1.6833], [5.7, 1.3856, 1.3833]], b: [[5.8282, 0.6718, 1.125], [5.8282, 0.6718, 2.075], [5.3686, 1.1314, 1.75], [5.3686, 1.1314, 1.45]], collide: 1}
      - {kind: loft, a: [[5.8282, 0.6718, 1.125], [5.8282, 0.6718, 2.075], [5.3686, 1.1314, 1.75], [5.3686, 1.1314, 1.45]], b: [[5.6773, 0.475, 1.1917], [5.6773, 0.475, 2.1417], [5.1144, 0.8, 1.8167], [5.1144, 0.8, 1.5167]], collide: 1}
      - {kind: loft, a: [[5.6773, 0.475, 1.1917], [5.6773, 0.475, 2.1417], [5.1144, 0.8, 1.8167], [5.1144, 0.8, 1.5167]], b: [[5.5824, 0.2459, 1.2583], [5.5824, 0.2459, 2.2083], [4.9545, 0.4141, 1.8833], [4.9545, 0.4141, 1.5833]], collide: 1}
      - {kind: loft, a: [[5.5824, 0.2459, 1.2583], [5.5824, 0.2459, 2.2083], [4.9545, 0.4141, 1.8833], [4.9545, 0.4141, 1.5833]], b: [[5.55, 0.0, 1.325], [5.55, 0.0, 2.275], [4.9, 0.0, 1.95], [4.9, 0.0, 1.65]], collide: 1}
      - {kind: loft, a: [[5.55, 0.0, 1.325], [5.55, 0.0, 2.275], [4.9, 0.0, 1.95], [4.9, 0.0, 1.65]], b: [[5.5824, -0.2459, 1.3917], [5.5824, -0.2459, 2.3417], [4.9545, -0.4141, 2.0167], [4.9545, -0.4141, 1.7167]], collide: 1}
      - {kind: loft, a: [[5.5824, -0.2459, 1.3917], [5.5824, -0.2459, 2.3417], [4.9545, -0.4141, 2.0167], [4.9545, -0.4141, 1.7167]], b: [[5.6773, -0.475, 1.4583], [5.6773, -0.475, 2.4083], [5.1144, -0.8, 2.0833], [5.1144, -0.8, 1.7833]], collide: 1}
      - {kind: loft, a: [[5.6773, -0.475, 1.4583], [5.6773, -0.475, 2.4083], [5.1144, -0.8, 2.0833], [5.1144, -0.8, 1.7833]], b: [[5.8282, -0.6718, 1.525], [5.8282, -0.6718, 2.475], [5.3686, -1.1314, 2.15], [5.3686, -1.1314, 1.85]], collide: 1}
      - {kind: loft, a: [[5.8282, -0.6718, 1.525], [5.8282, -0.6718, 2.475], [5.3686, -1.1314, 2.15], [5.3686, -1.1314, 1.85]], b: [[6.025, -0.8227, 1.5917], [6.025, -0.8227, 2.5417], [5.7, -1.3856, 2.2167], [5.7, -1.3856, 1.9167]], collide: 1}
      - {kind: loft, a: [[6.025, -0.8227, 1.5917], [6.025, -0.8227, 2.5417], [5.7, -1.3856, 2.2167], [5.7, -1.3856, 1.9167]], b: [[6.2541, -0.9176, 1.6583], [6.2541, -0.9176, 2.6083], [6.0859, -1.5455, 2.2833], [6.0859, -1.5455, 1.9833]], collide: 1}
      - {kind: loft, a: [[6.2541, -0.9176, 1.6583], [6.2541, -0.9176, 2.6083], [6.0859, -1.5455, 2.2833], [6.0859, -1.5455, 1.9833]], b: [[6.5, -0.95, 1.725], [6.5, -0.95, 2.675], [6.5, -1.6, 2.35], [6.5, -1.6, 2.05]], collide: 1}
      - {kind: loft, a: [[6.5, -0.95, 1.725], [6.5, -0.95, 2.675], [6.5, -1.6, 2.35], [6.5, -1.6, 2.05]], b: [[6.7459, -0.9176, 1.7917], [6.7459, -0.9176, 2.7417], [6.9141, -1.5455, 2.4167], [6.9141, -1.5455, 2.1167]], collide: 1}
      - {kind: loft, a: [[6.7459, -0.9176, 1.7917], [6.7459, -0.9176, 2.7417], [6.9141, -1.5455, 2.4167], [6.9141, -1.5455, 2.1167]], b: [[6.975, -0.8227, 1.8583], [6.975, -0.8227, 2.8083], [7.3, -1.3856, 2.4833], [7.3, -1.3856, 2.1833]], collide: 1}
      - {kind: loft, a: [[6.975, -0.8227, 1.8583], [6.975, -0.8227, 2.8083], [7.3, -1.3856, 2.4833], [7.3, -1.3856, 2.1833]], b: [[7.1718, -0.6718, 1.925], [7.1718, -0.6718, 2.875], [7.6314, -1.1314, 2.55], [7.6314, -1.1314, 2.25]], collide: 1}
      - {kind: loft, a: [[7.1718, -0.6718, 1.925], [7.1718, -0.6718, 2.875], [7.6314, -1.1314, 2.55], [7.6314, -1.1314, 2.25]], b: [[7.3227, -0.475, 1.9917], [7.3227, -0.475, 2.9417], [7.8856, -0.8, 2.6167], [7.8856, -0.8, 2.3167]], collide: 1}
      - {kind: loft, a: [[7.3227, -0.475, 1.9917], [7.3227, -0.475, 2.9417], [7.8856, -0.8, 2.6167], [7.8856, -0.8, 2.3167]], b: [[7.4176, -0.2459, 2.0583], [7.4176, -0.2459, 3.0083], [8.0455, -0.4141, 2.6833], [8.0455, -0.4141, 2.3833]], collide: 1}
      - {kind: loft, a: [[7.4176, -0.2459, 2.0583], [7.4176, -0.2459, 3.0083], [8.0455, -0.4141, 2.6833], [8.0455, -0.4141, 2.3833]], b: [[7.45, -0.0, 2.125], [7.45, -0.0, 3.075], [8.1, -0.0, 2.75], [8.1, -0.0, 2.45]], collide: 1}
      - {kind: loft, a: [[7.45, -0.0, 2.125], [7.45, -0.0, 3.075], [8.1, -0.0, 2.75], [8.1, -0.0, 2.45]], b: [[7.4176, 0.2459, 2.1917], [7.4176, 0.2459, 3.1417], [8.0455, 0.4141, 2.8167], [8.0455, 0.4141, 2.5167]], collide: 1}
      - {kind: loft, a: [[7.4176, 0.2459, 2.1917], [7.4176, 0.2459, 3.1417], [8.0455, 0.4141, 2.8167], [8.0455, 0.4141, 2.5167]], b: [[7.3227, 0.475, 2.2583], [7.3227, 0.475, 3.2083], [7.8856, 0.8, 2.8833], [7.8856, 0.8, 2.5833]], collide: 1}
      - {kind: loft, a: [[7.3227, 0.475, 2.2583], [7.3227, 0.475, 3.2083], [7.8856, 0.8, 2.8833], [7.8856, 0.8, 2.5833]], b: [[7.1718, 0.6718, 2.325], [7.1718, 0.6718, 3.275], [7.6314, 1.1314, 2.95], [7.6314, 1.1314, 2.65]], collide: 1}
      - {kind: loft, a: [[7.1718, 0.6718, 2.325], [7.1718, 0.6718, 3.275], [7.6314, 1.1314, 2.95], [7.6314, 1.1314, 2.65]], b: [[6.975, 0.8227, 2.3917], [6.975, 0.8227, 3.3417], [7.3, 1.3856, 3.0167], [7.3, 1.3856, 2.7167]], collide: 1}
      - {kind: loft, a: [[6.975, 0.8227, 2.3917], [6.975, 0.8227, 3.3417], [7.3, 1.3856, 3.0167], [7.3, 1.3856, 2.7167]], b: [[6.7459, 0.9176, 2.4583], [6.7459, 0.9176, 3.4083], [6.9141, 1.5455, 3.0833], [6.9141, 1.5455, 2.7833]], collide: 1}
      - {kind: loft, a: [[6.7459, 0.9176, 2.4583], [6.7459, 0.9176, 3.4083], [6.9141, 1.5455, 3.0833], [6.9141, 1.5455, 2.7833]], b: [[6.5, 0.95, 2.525], [6.5, 0.95, 3.475], [6.5, 1.6, 3.15], [6.5, 1.6, 2.85]], collide: 1}
      - {kind: loft, a: [[6.5, 0.95, 2.525], [6.5, 0.95, 3.475], [6.5, 1.6, 3.15], [6.5, 1.6, 2.85]], b: [[6.2541, 0.9176, 2.5917], [6.2541, 0.9176, 3.5417], [6.0859, 1.5455, 3.2167], [6.0859, 1.5455, 2.9167]], collide: 1}
      - {kind: loft, a: [[6.2541, 0.9176, 2.5917], [6.2541, 0.9176, 3.5417], [6.0859, 1.5455, 3.2167], [6.0859, 1.5455, 2.9167]], b: [[6.025, 0.8227, 2.6583], [6.025, 0.8227, 3.6083], [5.7, 1.3856, 3.2833], [5.7, 1.3856, 2.9833]], collide: 1}
      - {kind: loft, a: [[6.025, 0.8227, 2.6583], [6.025, 0.8227, 3.6083], [5.7, 1.3856, 3.2833], [5.7, 1.3856, 2.9833]], b: [[5.8282, 0.6718, 2.725], [5.8282, 0.6718, 3.675], [5.3686, 1.1314, 3.35], [5.3686, 1.1314, 3.05]], collide: 1}
      - {kind: loft, a: [[5.8282, 0.6718, 2.725], [5.8282, 0.6718, 3.675], [5.3686, 1.1314, 3.35], [5.3686, 1.1314, 3.05]], b: [[5.6773, 0.475, 2.7917], [5.6773, 0.475, 3.7417], [5.1144, 0.8, 3.4167], [5.1144, 0.8, 3.1167]], collide: 1}
      - {kind: loft, a: [[5.6773, 0.475, 2.7917], [5.6773, 0.475, 3.7417], [5.1144, 0.8, 3.4167], [5.1144, 0.8, 3.1167]], b: [[5.5824, 0.2459, 2.8583], [5.5824, 0.2459, 3.8083], [4.9545, 0.4141, 3.4833], [4.9545, 0.4141, 3.1833]], collide: 1}
      - {kind: loft, a: [[5.5824, 0.2459, 2.8583], [5.5824, 0.2459, 3.8083], [4.9545, 0.4141, 3.4833], [4.9545, 0.4141, 3.1833]], b: [[5.55, 0.0, 2.925], [5.55, 0.0, 3.875], [4.9, 0.0, 3.55], [4.9, 0.0, 3.25]], collide: 1}
      - {kind: loft, a: [[5.55, 0.0, 2.925], [5.55, 0.0, 3.875], [4.9, 0.0, 3.55], [4.9, 0.0, 3.25]], b: [[5.5824, -0.2459, 2.9917], [5.5824, -0.2459, 3.9417], [4.9545, -0.4141, 3.6167], [4.9545, -0.4141, 3.3167]], collide: 1}
      - {kind: loft, a: [[5.5824, -0.2459, 2.9917], [5.5824, -0.2459, 3.9417], [4.9545, -0.4141, 3.6167], [4.9545, -0.4141, 3.3167]], b: [[5.6773, -0.475, 3.0583], [5.6773, -0.475, 4.0083], [5.1144, -0.8, 3.6833], [5.1144, -0.8, 3.3833]], collide: 1}
      - {kind: loft, a: [[5.6773, -0.475, 3.0583], [5.6773, -0.475, 4.0083], [5.1144, -0.8, 3.6833], [5.1144, -0.8, 3.3833]], b: [[5.8282, -0.6718, 3.125], [5.8282, -0.6718, 4.075], [5.3686, -1.1314, 3.75], [5.3686, -1.1314, 3.45]], collide: 1}
      - {kind: loft, a: [[5.8282, -0.6718, 3.125], [5.8282, -0.6718, 4.075], [5.3686, -1.1314, 3.75], [5.3686, -1.1314, 3.45]], b: [[6.025, -0.8227, 3.1917], [6.025, -0.8227, 4.1417], [5.7, -1.3856, 3.8167], [5.7, -1.3856, 3.5167]], collide: 1}
      - {kind: loft, a: [[6.025, -0.8227, 3.1917], [6.025, -0.8227, 4.1417], [5.7, -1.3856, 3.8167], [5.7, -1.3856, 3.5167]], b: [[6.2541, -0.9176, 3.2583], [6.2541, -0.9176, 4.2083], [6.0859, -1.5455, 3.8833], [6.0859, -1.5455, 3.5833]], collide: 1}
      - {kind: loft, a: [[6.2541, -0.9176, 3.2583], [6.2541, -0.9176, 4.2083], [6.0859, -1.5455, 3.8833], [6.0859, -1.5455, 3.5833]], b: [[6.5, -0.95, 3.325], [6.5, -0.95, 4.275], [6.5, -1.6, 3.95], [6.5, -1.6, 3.65]], collide: 1}
      - {kind: loft, a: [[6.5, -0.95, 3.325], [6.5, -0.95, 4.275], [6.5, -1.6, 3.95], [6.5, -1.6, 3.65]], b: [[6.7459, -0.9176, 3.3917], [6.7459, -0.9176, 4.3417], [6.9141, -1.5455, 4.0167], [6.9141, -1.5455, 3.7167]], collide: 1}
      - {kind: loft, a: [[6.7459, -0.9176, 3.3917], [6.7459, -0.9176, 4.3417], [6.9141, -1.5455, 4.0167], [6.9141, -1.5455, 3.7167]], b: [[6.975, -0.8227, 3.4583], [6.975, -0.8227, 4.4083], [7.3, -1.3856, 4.0833], [7.3, -1.3856, 3.7833]], collide: 1}
      - {kind: loft, a: [[6.975, -0.8227, 3.4583], [6.975, -0.8227, 4.4083], [7.3, -1.3856, 4.0833], [7.3, -1.3856, 3.7833]], b: [[7.1718, -0.6718, 3.525], [7.1718, -0.6718, 4.475], [7.6314, -1.1314, 4.15], [7.6314, -1.1314, 3.85]], collide: 1}
      - {kind: loft, a: [[7.1718, -0.6718, 3.525], [7.1718, -0.6718, 4.475], [7.6314, -1.1314, 4.15], [7.6314, -1.1314, 3.85]], b: [[7.3227, -0.475, 3.5917], [7.3227, -0.475, 4.5417], [7.8856, -0.8, 4.2167], [7.8856, -0.8, 3.9167]], collide: 1}
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      - {kind: loft, a: [[6.2541, 0.9176, 7.3917], [6.2541, 0.9176, 8.3417], [6.0859, 1.5455, 8.0167], [6.0859, 1.5455, 7.7167]], b: [[6.025, 0.8227, 7.4583], [6.025, 0.8227, 8.4083], [5.7, 1.3856, 8.0833], [5.7, 1.3856, 7.7833]], collide: 1}
      - {kind: loft, a: [[6.025, 0.8227, 7.4583], [6.025, 0.8227, 8.4083], [5.7, 1.3856, 8.0833], [5.7, 1.3856, 7.7833]], b: [[5.8282, 0.6718, 7.525], [5.8282, 0.6718, 8.475], [5.3686, 1.1314, 8.15], [5.3686, 1.1314, 7.85]], collide: 1}
      - {kind: loft, a: [[5.8282, 0.6718, 7.525], [5.8282, 0.6718, 8.475], [5.3686, 1.1314, 8.15], [5.3686, 1.1314, 7.85]], b: [[5.6773, 0.475, 7.5917], [5.6773, 0.475, 8.5417], [5.1144, 0.8, 8.2167], [5.1144, 0.8, 7.9167]], collide: 1}
      - {kind: loft, a: [[5.6773, 0.475, 7.5917], [5.6773, 0.475, 8.5417], [5.1144, 0.8, 8.2167], [5.1144, 0.8, 7.9167]], b: [[5.5824, 0.2459, 7.6583], [5.5824, 0.2459, 8.6083], [4.9545, 0.4141, 8.2833], [4.9545, 0.4141, 7.9833]], collide: 1}
      - {kind: loft, a: [[5.5824, 0.2459, 7.6583], [5.5824, 0.2459, 8.6083], [4.9545, 0.4141, 8.2833], [4.9545, 0.4141, 7.9833]], b: [[5.55, -0.0, 7.725], [5.55, -0.0, 8.675], [4.9, -0.0, 8.35], [4.9, -0.0, 8.05]], collide: 1}
      - {kind: loft, a: [[5.55, -0.0, 7.725], [5.55, -0.0, 8.675], [4.9, -0.0, 8.35], [4.9, -0.0, 8.05]], b: [[5.5824, -0.2459, 7.7917], [5.5824, -0.2459, 8.7417], [4.9545, -0.4141, 8.4167], [4.9545, -0.4141, 8.1167]], collide: 1}
      - {kind: loft, a: [[5.5824, -0.2459, 7.7917], [5.5824, -0.2459, 8.7417], [4.9545, -0.4141, 8.4167], [4.9545, -0.4141, 8.1167]], b: [[5.6773, -0.475, 7.8583], [5.6773, -0.475, 8.8083], [5.1144, -0.8, 8.4833], [5.1144, -0.8, 8.1833]], collide: 1}
      - {kind: loft, a: [[5.6773, -0.475, 7.8583], [5.6773, -0.475, 8.8083], [5.1144, -0.8, 8.4833], [5.1144, -0.8, 8.1833]], b: [[5.8282, -0.6718, 7.925], [5.8282, -0.6718, 8.875], [5.3686, -1.1314, 8.55], [5.3686, -1.1314, 8.25]], collide: 1}
      - {kind: loft, a: [[5.8282, -0.6718, 7.925], [5.8282, -0.6718, 8.875], [5.3686, -1.1314, 8.55], [5.3686, -1.1314, 8.25]], b: [[6.025, -0.8227, 7.9917], [6.025, -0.8227, 8.9417], [5.7, -1.3856, 8.6167], [5.7, -1.3856, 8.3167]], collide: 1}
      - {kind: loft, a: [[6.025, -0.8227, 7.9917], [6.025, -0.8227, 8.9417], [5.7, -1.3856, 8.6167], [5.7, -1.3856, 8.3167]], b: [[6.2541, -0.9176, 8.0583], [6.2541, -0.9176, 9.0083], [6.0859, -1.5455, 8.6833], [6.0859, -1.5455, 8.3833]], collide: 1}
      - {kind: loft, a: [[6.2541, -0.9176, 8.0583], [6.2541, -0.9176, 9.0083], [6.0859, -1.5455, 8.6833], [6.0859, -1.5455, 8.3833]], b: [[6.5, -0.95, 8.125], [6.5, -0.95, 9.075], [6.5, -1.6, 8.75], [6.5, -1.6, 8.45]], collide: 1}
      - {kind: loft, a: [[6.5, -0.95, 8.125], [6.5, -0.95, 9.075], [6.5, -1.6, 8.75], [6.5, -1.6, 8.45]], b: [[6.7459, -0.9176, 8.1917], [6.7459, -0.9176, 9.1417], [6.9141, -1.5455, 8.8167], [6.9141, -1.5455, 8.5167]], collide: 1}
      - {kind: loft, a: [[6.7459, -0.9176, 8.1917], [6.7459, -0.9176, 9.1417], [6.9141, -1.5455, 8.8167], [6.9141, -1.5455, 8.5167]], b: [[6.975, -0.8227, 8.2583], [6.975, -0.8227, 9.2083], [7.3, -1.3856, 8.8833], [7.3, -1.3856, 8.5833]], collide: 1}
      - {kind: loft, a: [[6.975, -0.8227, 8.2583], [6.975, -0.8227, 9.2083], [7.3, -1.3856, 8.8833], [7.3, -1.3856, 8.5833]], b: [[7.1718, -0.6718, 8.325], [7.1718, -0.6718, 9.275], [7.6314, -1.1314, 8.95], [7.6314, -1.1314, 8.65]], collide: 1}
      - {kind: loft, a: [[7.1718, -0.6718, 8.325], [7.1718, -0.6718, 9.275], [7.6314, -1.1314, 8.95], [7.6314, -1.1314, 8.65]], b: [[7.3227, -0.475, 8.3917], [7.3227, -0.475, 9.3417], [7.8856, -0.8, 9.0167], [7.8856, -0.8, 8.7167]], collide: 1}
      - {kind: loft, a: [[7.3227, -0.475, 8.3917], [7.3227, -0.475, 9.3417], [7.8856, -0.8, 9.0167], [7.8856, -0.8, 8.7167]], b: [[7.4176, -0.2459, 8.4583], [7.4176, -0.2459, 9.4083], [8.0455, -0.4141, 9.0833], [8.0455, -0.4141, 8.7833]], collide: 1}
      - {kind: loft, a: [[7.4176, -0.2459, 8.4583], [7.4176, -0.2459, 9.4083], [8.0455, -0.4141, 9.0833], [8.0455, -0.4141, 8.7833]], b: [[7.45, -0.0, 8.525], [7.45, -0.0, 9.475], [8.1, -0.0, 9.15], [8.1, -0.0, 8.85]], collide: 1}
      - {kind: loft, a: [[7.45, -0.0, 8.525], [7.45, -0.0, 9.475], [8.1, -0.0, 9.15], [8.1, -0.0, 8.85]], b: [[7.4176, 0.2459, 8.5917], [7.4176, 0.2459, 9.5417], [8.0455, 0.4141, 9.2167], [8.0455, 0.4141, 8.9167]], collide: 1}
      - {kind: loft, a: [[7.4176, 0.2459, 8.5917], [7.4176, 0.2459, 9.5417], [8.0455, 0.4141, 9.2167], [8.0455, 0.4141, 8.9167]], b: [[7.3227, 0.475, 8.6583], [7.3227, 0.475, 9.6083], [7.8856, 0.8, 9.2833], [7.8856, 0.8, 8.9833]], collide: 1}
      - {kind: loft, a: [[7.3227, 0.475, 8.6583], [7.3227, 0.475, 9.6083], [7.8856, 0.8, 9.2833], [7.8856, 0.8, 8.9833]], b: [[7.1718, 0.6718, 8.725], [7.1718, 0.6718, 9.675], [7.6314, 1.1314, 9.35], [7.6314, 1.1314, 9.05]], collide: 1}
      - {kind: loft, a: [[7.1718, 0.6718, 8.725], [7.1718, 0.6718, 9.675], [7.6314, 1.1314, 9.35], [7.6314, 1.1314, 9.05]], b: [[6.975, 0.8227, 8.7917], [6.975, 0.8227, 9.7417], [7.3, 1.3856, 9.4167], [7.3, 1.3856, 9.1167]], collide: 1}
      - {kind: loft, a: [[6.975, 0.8227, 8.7917], [6.975, 0.8227, 9.7417], [7.3, 1.3856, 9.4167], [7.3, 1.3856, 9.1167]], b: [[6.7459, 0.9176, 8.8583], [6.7459, 0.9176, 9.8083], [6.9141, 1.5455, 9.4833], [6.9141, 1.5455, 9.1833]], collide: 1}
      - {kind: loft, a: [[6.7459, 0.9176, 8.8583], [6.7459, 0.9176, 9.8083], [6.9141, 1.5455, 9.4833], [6.9141, 1.5455, 9.1833]], b: [[6.5, 0.95, 8.925], [6.5, 0.95, 9.875], [6.5, 1.6, 9.55], [6.5, 1.6, 9.25]], collide: 1}
      - {kind: loft, a: [[6.5, 0.95, 8.925], [6.5, 0.95, 9.875], [6.5, 1.6, 9.55], [6.5, 1.6, 9.25]], b: [[6.2541, 0.9176, 8.9917], [6.2541, 0.9176, 9.9417], [6.0859, 1.5455, 9.6167], [6.0859, 1.5455, 9.3167]], collide: 1}
      - {kind: loft, a: [[6.2541, 0.9176, 8.9917], [6.2541, 0.9176, 9.9417], [6.0859, 1.5455, 9.6167], [6.0859, 1.5455, 9.3167]], b: [[6.025, 0.8227, 9.0583], [6.025, 0.8227, 10.0083], [5.7, 1.3856, 9.6833], [5.7, 1.3856, 9.3833]], collide: 1}
      - {kind: loft, a: [[6.025, 0.8227, 9.0583], [6.025, 0.8227, 10.0083], [5.7, 1.3856, 9.6833], [5.7, 1.3856, 9.3833]], b: [[5.8282, 0.6718, 9.125], [5.8282, 0.6718, 10.075], [5.3686, 1.1314, 9.75], [5.3686, 1.1314, 9.45]], collide: 1}
      - {kind: loft, a: [[5.8282, 0.6718, 9.125], [5.8282, 0.6718, 10.075], [5.3686, 1.1314, 9.75], [5.3686, 1.1314, 9.45]], b: [[5.6773, 0.475, 9.1917], [5.6773, 0.475, 10.1417], [5.1144, 0.8, 9.8167], [5.1144, 0.8, 9.5167]], collide: 1}
      - {kind: loft, a: [[5.6773, 0.475, 9.1917], [5.6773, 0.475, 10.1417], [5.1144, 0.8, 9.8167], [5.1144, 0.8, 9.5167]], b: [[5.5824, 0.2459, 9.2583], [5.5824, 0.2459, 10.2083], [4.9545, 0.4141, 9.8833], [4.9545, 0.4141, 9.5833]], collide: 1}
      - {kind: loft, a: [[5.5824, 0.2459, 9.2583], [5.5824, 0.2459, 10.2083], [4.9545, 0.4141, 9.8833], [4.9545, 0.4141, 9.5833]], b: [[5.55, -0.0, 9.325], [5.55, -0.0, 10.275], [4.9, -0.0, 9.95], [4.9, -0.0, 9.65]], collide: 1}
      - {kind: loft, a: [[5.55, -0.0, 9.325], [5.55, -0.0, 10.275], [4.9, -0.0, 9.95], [4.9, -0.0, 9.65]], b: [[5.5824, -0.2459, 9.3917], [5.5824, -0.2459, 10.3417], [4.9545, -0.4141, 10.0167], [4.9545, -0.4141, 9.7167]], collide: 1}
      - {kind: loft, a: [[5.5824, -0.2459, 9.3917], [5.5824, -0.2459, 10.3417], [4.9545, -0.4141, 10.0167], [4.9545, -0.4141, 9.7167]], b: [[5.6773, -0.475, 9.4583], [5.6773, -0.475, 10.4083], [5.1144, -0.8, 10.0833], [5.1144, -0.8, 9.7833]], collide: 1}
      - {kind: loft, a: [[5.6773, -0.475, 9.4583], [5.6773, -0.475, 10.4083], [5.1144, -0.8, 10.0833], [5.1144, -0.8, 9.7833]], b: [[5.8282, -0.6718, 9.525], [5.8282, -0.6718, 10.475], [5.3686, -1.1314, 10.15], [5.3686, -1.1314, 9.85]], collide: 1}
      - {kind: loft, a: [[5.8282, -0.6718, 9.525], [5.8282, -0.6718, 10.475], [5.3686, -1.1314, 10.15], [5.3686, -1.1314, 9.85]], b: [[6.025, -0.8227, 9.5917], [6.025, -0.8227, 10.5417], [5.7, -1.3856, 10.2167], [5.7, -1.3856, 9.9167]], collide: 1}
      - {kind: loft, a: [[6.025, -0.8227, 9.5917], [6.025, -0.8227, 10.5417], [5.7, -1.3856, 10.2167], [5.7, -1.3856, 9.9167]], b: [[6.2541, -0.9176, 9.6583], [6.2541, -0.9176, 10.6083], [6.0859, -1.5455, 10.2833], [6.0859, -1.5455, 9.9833]], collide: 1}
      - {kind: loft, a: [[6.2541, -0.9176, 9.6583], [6.2541, -0.9176, 10.6083], [6.0859, -1.5455, 10.2833], [6.0859, -1.5455, 9.9833]], b: [[6.5, -0.95, 9.725], [6.5, -0.95, 10.675], [6.5, -1.6, 10.35], [6.5, -1.6, 10.05]], collide: 1}
      - {kind: loft, a: [[6.5, -0.95, 9.725], [6.5, -0.95, 10.675], [6.5, -1.6, 10.35], [6.5, -1.6, 10.05]], b: [[6.7459, -0.9176, 9.7917], [6.7459, -0.9176, 10.7417], [6.9141, -1.5455, 10.4167], [6.9141, -1.5455, 10.1167]], collide: 1}
      - {kind: loft, a: [[6.7459, -0.9176, 9.7917], [6.7459, -0.9176, 10.7417], [6.9141, -1.5455, 10.4167], [6.9141, -1.5455, 10.1167]], b: [[6.975, -0.8227, 9.8583], [6.975, -0.8227, 10.8083], [7.3, -1.3856, 10.4833], [7.3, -1.3856, 10.1833]], collide: 1}
      - {kind: loft, a: [[6.975, -0.8227, 9.8583], [6.975, -0.8227, 10.8083], [7.3, -1.3856, 10.4833], [7.3, -1.3856, 10.1833]], b: [[7.1718, -0.6718, 9.925], [7.1718, -0.6718, 10.875], [7.6314, -1.1314, 10.55], [7.6314, -1.1314, 10.25]], collide: 1}
      - {kind: loft, a: [[7.1718, -0.6718, 9.925], [7.1718, -0.6718, 10.875], [7.6314, -1.1314, 10.55], [7.6314, -1.1314, 10.25]], b: [[7.3227, -0.475, 9.9917], [7.3227, -0.475, 10.9417], [7.8856, -0.8, 10.6167], [7.8856, -0.8, 10.3167]], collide: 1}
      - {kind: loft, a: [[7.3227, -0.475, 9.9917], [7.3227, -0.475, 10.9417], [7.8856, -0.8, 10.6167], [7.8856, -0.8, 10.3167]], b: [[7.4176, -0.2459, 10.0583], [7.4176, -0.2459, 11.0083], [8.0455, -0.4141, 10.6833], [8.0455, -0.4141, 10.3833]], collide: 1}
      - {kind: loft, a: [[7.4176, -0.2459, 10.0583], [7.4176, -0.2459, 11.0083], [8.0455, -0.4141, 10.6833], [8.0455, -0.4141, 10.3833]], b: [[7.45, -0.0, 10.125], [7.45, -0.0, 11.075], [8.1, -0.0, 10.75], [8.1, -0.0, 10.45]], collide: 1}
      - {kind: loft, a: [[7.45, -0.0, 10.125], [7.45, -0.0, 11.075], [8.1, -0.0, 10.75], [8.1, -0.0, 10.45]], b: [[7.4176, 0.2459, 10.1917], [7.4176, 0.2459, 11.1417], [8.0455, 0.4141, 10.8167], [8.0455, 0.4141, 10.5167]], collide: 1}
      - {kind: loft, a: [[7.4176, 0.2459, 10.1917], [7.4176, 0.2459, 11.1417], [8.0455, 0.4141, 10.8167], [8.0455, 0.4141, 10.5167]], b: [[7.3227, 0.475, 10.2583], [7.3227, 0.475, 11.2083], [7.8856, 0.8, 10.8833], [7.8856, 0.8, 10.5833]], collide: 1}
      - {kind: loft, a: [[7.3227, 0.475, 10.2583], [7.3227, 0.475, 11.2083], [7.8856, 0.8, 10.8833], [7.8856, 0.8, 10.5833]], b: [[7.1718, 0.6718, 10.325], [7.1718, 0.6718, 11.275], [7.6314, 1.1314, 10.95], [7.6314, 1.1314, 10.65]], collide: 1}
      - {kind: loft, a: [[7.1718, 0.6718, 10.325], [7.1718, 0.6718, 11.275], [7.6314, 1.1314, 10.95], [7.6314, 1.1314, 10.65]], b: [[6.975, 0.8227, 10.3917], [6.975, 0.8227, 11.3417], [7.3, 1.3856, 11.0167], [7.3, 1.3856, 10.7167]], collide: 1}
      - {kind: loft, a: [[6.975, 0.8227, 10.3917], [6.975, 0.8227, 11.3417], [7.3, 1.3856, 11.0167], [7.3, 1.3856, 10.7167]], b: [[6.7459, 0.9176, 10.4583], [6.7459, 0.9176, 11.4083], [6.9141, 1.5455, 11.0833], [6.9141, 1.5455, 10.7833]], collide: 1}
      - {kind: loft, a: [[6.7459, 0.9176, 10.4583], [6.7459, 0.9176, 11.4083], [6.9141, 1.5455, 11.0833], [6.9141, 1.5455, 10.7833]], b: [[6.5, 0.95, 10.525], [6.5, 0.95, 11.475], [6.5, 1.6, 11.15], [6.5, 1.6, 10.85]], collide: 1}
  - id: lnut
    shape: part
    pos: [-6.5, 0, 0]
    density: 7800
    friction: 0.1
    color: "#c9bfa8"
    pieces:
      - {kind: poly, points: [[-9.9, -7.0], [-9.1, -7.0], [-9.1, 7.0], [-9.9, 7.0]], y: [-1.6, 1.6]}   # its side
      - {kind: poly, points: [[-3.9, -7.0], [-3.1, -7.0], [-3.1, 7.0], [-3.9, 7.0]], y: [-1.6, 1.6]}   # its side
      - {kind: poly, points: [[-9.1, -7.0], [-3.9, -7.0], [-3.9, -3.8], [-9.1, -3.8]], y: [-1.6, 1.6]}   # its lower end
      - {kind: poly, points: [[-9.1, 4.5], [-3.9, 4.5], [-3.9, 7.0], [-9.1, 7.0]], y: [-1.6, 1.6]}   # its upper end
      - {kind: rod, from: [-6.5, 0, 4.0], to: [-6.5, 0, 4.6], radius: 1.6}   # the knob it turns on (drawn on the nut)
      - {kind: loft, a: [[-8.163, -0.6888, -6.81], [-8.163, -0.6888, -5.39], [-7.4701, -0.4018, -5.765], [-7.4701, -0.4018, -6.435]], b: [[-7.928, -1.0958, -6.7433], [-7.928, -1.0958, -5.3233], [-7.333, -0.6392, -5.6983], [-7.333, -0.6392, -6.3683]], collide: 2}
      - {kind: loft, a: [[-7.928, -1.0958, -6.7433], [-7.928, -1.0958, -5.3233], [-7.333, -0.6392, -5.6983], [-7.333, -0.6392, -6.3683]], b: [[-7.5958, -1.428, -6.6767], [-7.5958, -1.428, -5.2567], [-7.1392, -0.833, -5.6317], [-7.1392, -0.833, -6.3017]], collide: 2}
      - {kind: loft, a: [[-7.5958, -1.428, -6.6767], [-7.5958, -1.428, -5.2567], [-7.1392, -0.833, -5.6317], [-7.1392, -0.833, -6.3017]], b: [[-7.1888, -1.663, -6.61], [-7.1888, -1.663, -5.19], [-6.9018, -0.9701, -5.565], [-6.9018, -0.9701, -6.235]], collide: 2}
      - {kind: loft, a: [[-7.1888, -1.663, -6.61], [-7.1888, -1.663, -5.19], [-6.9018, -0.9701, -5.565], [-6.9018, -0.9701, -6.235]], b: [[-6.7349, -1.7846, -6.5433], [-6.7349, -1.7846, -5.1233], [-6.6371, -1.041, -5.4983], [-6.6371, -1.041, -6.1683]], collide: 2}
      - {kind: loft, a: [[-6.7349, -1.7846, -6.5433], [-6.7349, -1.7846, -5.1233], [-6.6371, -1.041, -5.4983], [-6.6371, -1.041, -6.1683]], b: [[-6.2651, -1.7846, -6.4767], [-6.2651, -1.7846, -5.0567], [-6.3629, -1.041, -5.4317], [-6.3629, -1.041, -6.1017]], collide: 2}
      - {kind: loft, a: [[-6.2651, -1.7846, -6.4767], [-6.2651, -1.7846, -5.0567], [-6.3629, -1.041, -5.4317], [-6.3629, -1.041, -6.1017]], b: [[-5.8112, -1.663, -6.41], [-5.8112, -1.663, -4.99], [-6.0982, -0.9701, -5.365], [-6.0982, -0.9701, -6.035]], collide: 2}
      - {kind: loft, a: [[-5.8112, -1.663, -6.41], [-5.8112, -1.663, -4.99], [-6.0982, -0.9701, -5.365], [-6.0982, -0.9701, -6.035]], b: [[-5.4042, -1.428, -6.3433], [-5.4042, -1.428, -4.9233], [-5.8608, -0.833, -5.2983], [-5.8608, -0.833, -5.9683]], collide: 2}
      - {kind: loft, a: [[-5.4042, -1.428, -6.3433], [-5.4042, -1.428, -4.9233], [-5.8608, -0.833, -5.2983], [-5.8608, -0.833, -5.9683]], b: [[-5.072, -1.0958, -6.2767], [-5.072, -1.0958, -4.8567], [-5.667, -0.6392, -5.2317], [-5.667, -0.6392, -5.9017]], collide: 2}
      - {kind: loft, a: [[-5.072, -1.0958, -6.2767], [-5.072, -1.0958, -4.8567], [-5.667, -0.6392, -5.2317], [-5.667, -0.6392, -5.9017]], b: [[-4.837, -0.6888, -6.21], [-4.837, -0.6888, -4.79], [-5.5299, -0.4018, -5.165], [-5.5299, -0.4018, -5.835]], collide: 2}
      - {kind: loft, a: [[-4.837, -0.6888, -6.21], [-4.837, -0.6888, -4.79], [-5.5299, -0.4018, -5.165], [-5.5299, -0.4018, -5.835]], b: [[-4.7154, -0.2349, -6.1433], [-4.7154, -0.2349, -4.7233], [-5.459, -0.1371, -5.0983], [-5.459, -0.1371, -5.7683]], collide: 2}
      - {kind: loft, a: [[-4.7154, -0.2349, -6.1433], [-4.7154, -0.2349, -4.7233], [-5.459, -0.1371, -5.0983], [-5.459, -0.1371, -5.7683]], b: [[-4.7154, 0.2349, -6.0767], [-4.7154, 0.2349, -4.6567], [-5.459, 0.1371, -5.0317], [-5.459, 0.1371, -5.7017]], collide: 2}
      - {kind: loft, a: [[-4.7154, 0.2349, -6.0767], [-4.7154, 0.2349, -4.6567], [-5.459, 0.1371, -5.0317], [-5.459, 0.1371, -5.7017]], b: [[-4.837, 0.6888, -6.01], [-4.837, 0.6888, -4.59], [-5.5299, 0.4018, -4.965], [-5.5299, 0.4018, -5.635]], collide: 2}
      - {kind: loft, a: [[-4.837, 0.6888, -6.01], [-4.837, 0.6888, -4.59], [-5.5299, 0.4018, -4.965], [-5.5299, 0.4018, -5.635]], b: [[-5.072, 1.0958, -5.9433], [-5.072, 1.0958, -4.5233], [-5.667, 0.6392, -4.8983], [-5.667, 0.6392, -5.5683]], collide: 2}
      - {kind: loft, a: [[-5.072, 1.0958, -5.9433], [-5.072, 1.0958, -4.5233], [-5.667, 0.6392, -4.8983], [-5.667, 0.6392, -5.5683]], b: [[-5.4042, 1.428, -5.8767], [-5.4042, 1.428, -4.4567], [-5.8608, 0.833, -4.8317], [-5.8608, 0.833, -5.5017]], collide: 2}
      - {kind: loft, a: [[-5.4042, 1.428, -5.8767], [-5.4042, 1.428, -4.4567], [-5.8608, 0.833, -4.8317], [-5.8608, 0.833, -5.5017]], b: [[-5.8112, 1.663, -5.81], [-5.8112, 1.663, -4.39], [-6.0982, 0.9701, -4.765], [-6.0982, 0.9701, -5.435]], collide: 2}
      - {kind: loft, a: [[-5.8112, 1.663, -5.81], [-5.8112, 1.663, -4.39], [-6.0982, 0.9701, -4.765], [-6.0982, 0.9701, -5.435]], b: [[-6.2651, 1.7846, -5.7433], [-6.2651, 1.7846, -4.3233], [-6.3629, 1.041, -4.6983], [-6.3629, 1.041, -5.3683]], collide: 2}
      - {kind: loft, a: [[-6.2651, 1.7846, -5.7433], [-6.2651, 1.7846, -4.3233], [-6.3629, 1.041, -4.6983], [-6.3629, 1.041, -5.3683]], b: [[-6.7349, 1.7846, -5.6767], [-6.7349, 1.7846, -4.2567], [-6.6371, 1.041, -4.6317], [-6.6371, 1.041, -5.3017]], collide: 2}
      - {kind: loft, a: [[-6.7349, 1.7846, -5.6767], [-6.7349, 1.7846, -4.2567], [-6.6371, 1.041, -4.6317], [-6.6371, 1.041, -5.3017]], b: [[-7.1888, 1.663, -5.61], [-7.1888, 1.663, -4.19], [-6.9018, 0.9701, -4.565], [-6.9018, 0.9701, -5.235]], collide: 2}
      - {kind: loft, a: [[-7.1888, 1.663, -5.61], [-7.1888, 1.663, -4.19], [-6.9018, 0.9701, -4.565], [-6.9018, 0.9701, -5.235]], b: [[-7.5958, 1.428, -5.5433], [-7.5958, 1.428, -4.1233], [-7.1392, 0.833, -4.4983], [-7.1392, 0.833, -5.1683]], collide: 2}
      - {kind: loft, a: [[-7.5958, 1.428, -5.5433], [-7.5958, 1.428, -4.1233], [-7.1392, 0.833, -4.4983], [-7.1392, 0.833, -5.1683]], b: [[-7.928, 1.0958, -5.4767], [-7.928, 1.0958, -4.0567], [-7.333, 0.6392, -4.4317], [-7.333, 0.6392, -5.1017]], collide: 2}
      - {kind: loft, a: [[-7.928, 1.0958, -5.4767], [-7.928, 1.0958, -4.0567], [-7.333, 0.6392, -4.4317], [-7.333, 0.6392, -5.1017]], b: [[-8.163, 0.6888, -5.41], [-8.163, 0.6888, -3.99], [-7.4701, 0.4018, -4.365], [-7.4701, 0.4018, -5.035]], collide: 2}
      - {kind: loft, a: [[-8.163, 0.6888, -5.41], [-8.163, 0.6888, -3.99], [-7.4701, 0.4018, -4.365], [-7.4701, 0.4018, -5.035]], b: [[-8.2846, 0.2349, -5.3433], [-8.2846, 0.2349, -3.9233], [-7.541, 0.1371, -4.2983], [-7.541, 0.1371, -4.9683]], collide: 2}
      - {kind: loft, a: [[-8.2846, 0.2349, -5.3433], [-8.2846, 0.2349, -3.9233], [-7.541, 0.1371, -4.2983], [-7.541, 0.1371, -4.9683]], b: [[-8.2846, -0.2349, -5.2767], [-8.2846, -0.2349, -3.8567], [-7.541, -0.1371, -4.2317], [-7.541, -0.1371, -4.9017]], collide: 2}
      - {kind: loft, a: [[-8.2846, -0.2349, -5.2767], [-8.2846, -0.2349, -3.8567], [-7.541, -0.1371, -4.2317], [-7.541, -0.1371, -4.9017]], b: [[-8.163, -0.6888, -5.21], [-8.163, -0.6888, -3.79], [-7.4701, -0.4018, -4.165], [-7.4701, -0.4018, -4.835]], collide: 2}
      - {kind: loft, a: [[-8.163, -0.6888, -5.21], [-8.163, -0.6888, -3.79], [-7.4701, -0.4018, -4.165], [-7.4701, -0.4018, -4.835]], b: [[-7.928, -1.0958, -5.1433], [-7.928, -1.0958, -3.7233], [-7.333, -0.6392, -4.0983], [-7.333, -0.6392, -4.7683]], collide: 2}
      - {kind: loft, a: [[-7.928, -1.0958, -5.1433], [-7.928, -1.0958, -3.7233], [-7.333, -0.6392, -4.0983], [-7.333, -0.6392, -4.7683]], b: [[-7.5958, -1.428, -5.0767], [-7.5958, -1.428, -3.6567], [-7.1392, -0.833, -4.0317], [-7.1392, -0.833, -4.7017]], collide: 2}
      - {kind: loft, a: [[-7.5958, -1.428, -5.0767], [-7.5958, -1.428, -3.6567], [-7.1392, -0.833, -4.0317], [-7.1392, -0.833, -4.7017]], b: [[-7.1888, -1.663, -5.01], [-7.1888, -1.663, -3.59], [-6.9018, -0.9701, -3.965], [-6.9018, -0.9701, -4.635]], collide: 2}
      - {kind: loft, a: [[-7.1888, -1.663, -5.01], [-7.1888, -1.663, -3.59], [-6.9018, -0.9701, -3.965], [-6.9018, -0.9701, -4.635]], b: [[-6.7349, -1.7846, -4.9433], [-6.7349, -1.7846, -3.5233], [-6.6371, -1.041, -3.8983], [-6.6371, -1.041, -4.5683]], collide: 2}
      - {kind: loft, a: [[-6.7349, -1.7846, -4.9433], [-6.7349, -1.7846, -3.5233], [-6.6371, -1.041, -3.8983], [-6.6371, -1.041, -4.5683]], b: [[-6.2651, -1.7846, -4.8767], [-6.2651, -1.7846, -3.4567], [-6.3629, -1.041, -3.8317], [-6.3629, -1.041, -4.5017]], collide: 2}
      - {kind: loft, a: [[-6.2651, -1.7846, -4.8767], [-6.2651, -1.7846, -3.4567], [-6.3629, -1.041, -3.8317], [-6.3629, -1.041, -4.5017]], b: [[-5.8112, -1.663, -4.81], [-5.8112, -1.663, -3.39], [-6.0982, -0.9701, -3.765], [-6.0982, -0.9701, -4.435]], collide: 2}
      - {kind: loft, a: [[-5.8112, -1.663, -4.81], [-5.8112, -1.663, -3.39], [-6.0982, -0.9701, -3.765], [-6.0982, -0.9701, -4.435]], b: [[-5.4042, -1.428, -4.7433], [-5.4042, -1.428, -3.3233], [-5.8608, -0.833, -3.6983], [-5.8608, -0.833, -4.3683]], collide: 2}
      - {kind: loft, a: [[-5.4042, -1.428, -4.7433], [-5.4042, -1.428, -3.3233], [-5.8608, -0.833, -3.6983], [-5.8608, -0.833, -4.3683]], b: [[-5.072, -1.0958, -4.6767], [-5.072, -1.0958, -3.2567], [-5.667, -0.6392, -3.6317], [-5.667, -0.6392, -4.3017]], collide: 2}
      - {kind: loft, a: [[-5.072, -1.0958, -4.6767], [-5.072, -1.0958, -3.2567], [-5.667, -0.6392, -3.6317], [-5.667, -0.6392, -4.3017]], b: [[-4.837, -0.6888, -4.61], [-4.837, -0.6888, -3.19], [-5.5299, -0.4018, -3.565], [-5.5299, -0.4018, -4.235]], collide: 2}
      - {kind: loft, a: [[-4.837, -0.6888, -4.61], [-4.837, -0.6888, -3.19], [-5.5299, -0.4018, -3.565], [-5.5299, -0.4018, -4.235]], b: [[-4.7154, -0.2349, -4.5433], [-4.7154, -0.2349, -3.1233], [-5.459, -0.1371, -3.4983], [-5.459, -0.1371, -4.1683]], collide: 2}
      - {kind: loft, a: [[-4.7154, -0.2349, -4.5433], [-4.7154, -0.2349, -3.1233], [-5.459, -0.1371, -3.4983], [-5.459, -0.1371, -4.1683]], b: [[-4.7154, 0.2349, -4.4767], [-4.7154, 0.2349, -3.0567], [-5.459, 0.1371, -3.4317], [-5.459, 0.1371, -4.1017]], collide: 2}
      - {kind: loft, a: [[-4.7154, 0.2349, -4.4767], [-4.7154, 0.2349, -3.0567], [-5.459, 0.1371, -3.4317], [-5.459, 0.1371, -4.1017]], b: [[-4.837, 0.6888, -4.41], [-4.837, 0.6888, -2.99], [-5.5299, 0.4018, -3.365], [-5.5299, 0.4018, -4.035]], collide: 2}
      - {kind: loft, a: [[-4.837, 0.6888, -4.41], [-4.837, 0.6888, -2.99], [-5.5299, 0.4018, -3.365], [-5.5299, 0.4018, -4.035]], b: [[-5.072, 1.0958, -4.3433], [-5.072, 1.0958, -2.9233], [-5.667, 0.6392, -3.2983], [-5.667, 0.6392, -3.9683]], collide: 2}
      - {kind: loft, a: [[-5.072, 1.0958, -4.3433], [-5.072, 1.0958, -2.9233], [-5.667, 0.6392, -3.2983], [-5.667, 0.6392, -3.9683]], b: [[-5.4042, 1.428, -4.2767], [-5.4042, 1.428, -2.8567], [-5.8608, 0.833, -3.2317], [-5.8608, 0.833, -3.9017]], collide: 2}
      - {kind: loft, a: [[-5.4042, 1.428, -4.2767], [-5.4042, 1.428, -2.8567], [-5.8608, 0.833, -3.2317], [-5.8608, 0.833, -3.9017]], b: [[-5.8112, 1.663, -4.21], [-5.8112, 1.663, -2.79], [-6.0982, 0.9701, -3.165], [-6.0982, 0.9701, -3.835]], collide: 2}
      - {kind: loft, a: [[-5.8112, 1.663, -4.21], [-5.8112, 1.663, -2.79], [-6.0982, 0.9701, -3.165], [-6.0982, 0.9701, -3.835]], b: [[-6.2651, 1.7846, -4.1433], [-6.2651, 1.7846, -2.7233], [-6.3629, 1.041, -3.0983], [-6.3629, 1.041, -3.7683]], collide: 2}
      - {kind: loft, a: [[-6.2651, 1.7846, -4.1433], [-6.2651, 1.7846, -2.7233], [-6.3629, 1.041, -3.0983], [-6.3629, 1.041, -3.7683]], b: [[-6.7349, 1.7846, -4.0767], [-6.7349, 1.7846, -2.6567], [-6.6371, 1.041, -3.0317], [-6.6371, 1.041, -3.7017]], collide: 2}
      - {kind: loft, a: [[-6.7349, 1.7846, -4.0767], [-6.7349, 1.7846, -2.6567], [-6.6371, 1.041, -3.0317], [-6.6371, 1.041, -3.7017]], b: [[-7.1888, 1.663, -4.01], [-7.1888, 1.663, -2.59], [-6.9018, 0.9701, -2.965], [-6.9018, 0.9701, -3.635]], collide: 2}
      - {kind: loft, a: [[-7.1888, 1.663, -4.01], [-7.1888, 1.663, -2.59], [-6.9018, 0.9701, -2.965], [-6.9018, 0.9701, -3.635]], b: [[-7.5958, 1.428, -3.9433], [-7.5958, 1.428, -2.5233], [-7.1392, 0.833, -2.8983], [-7.1392, 0.833, -3.5683]], collide: 2}
      - {kind: loft, a: [[-7.5958, 1.428, -3.9433], [-7.5958, 1.428, -2.5233], [-7.1392, 0.833, -2.8983], [-7.1392, 0.833, -3.5683]], b: [[-7.928, 1.0958, -3.8767], [-7.928, 1.0958, -2.4567], [-7.333, 0.6392, -2.8317], [-7.333, 0.6392, -3.5017]], collide: 2}
      - {kind: loft, a: [[-7.928, 1.0958, -3.8767], [-7.928, 1.0958, -2.4567], [-7.333, 0.6392, -2.8317], [-7.333, 0.6392, -3.5017]], b: [[-8.163, 0.6888, -3.81], [-8.163, 0.6888, -2.39], [-7.4701, 0.4018, -2.765], [-7.4701, 0.4018, -3.435]], collide: 2}
      - {kind: loft, a: [[-8.163, 0.6888, -3.81], [-8.163, 0.6888, -2.39], [-7.4701, 0.4018, -2.765], [-7.4701, 0.4018, -3.435]], b: [[-8.2846, 0.2349, -3.7433], [-8.2846, 0.2349, -2.3233], [-7.541, 0.1371, -2.6983], [-7.541, 0.1371, -3.3683]], collide: 2}
      - {kind: loft, a: [[-8.2846, 0.2349, -3.7433], [-8.2846, 0.2349, -2.3233], [-7.541, 0.1371, -2.6983], [-7.541, 0.1371, -3.3683]], b: [[-8.2846, -0.2349, -3.6767], [-8.2846, -0.2349, -2.2567], [-7.541, -0.1371, -2.6317], [-7.541, -0.1371, -3.3017]], collide: 2}
      - {kind: loft, a: [[-8.2846, -0.2349, -3.6767], [-8.2846, -0.2349, -2.2567], [-7.541, -0.1371, -2.6317], [-7.541, -0.1371, -3.3017]], b: [[-8.163, -0.6888, -3.61], [-8.163, -0.6888, -2.19], [-7.4701, -0.4018, -2.565], [-7.4701, -0.4018, -3.235]], collide: 2}
  - id: lower
    shape: part
    pos: [0, 0, 0]
    density: 7800
    friction: 0.1
    color: "#9a948a"
    pieces:
      - {kind: rod, from: [-6.5, 0.0, -13.0], to: [-6.2785, 0.0, -14.6823], radius: 1.2}
      - {kind: rod, from: [-6.2785, 0.0, -14.6823], to: [-5.6292, 0.0, -16.25], radius: 1.2}
      - {kind: rod, from: [-5.6292, 0.0, -16.25], to: [-4.5962, 0.0, -17.5962], radius: 1.2}
      - {kind: rod, from: [-4.5962, 0.0, -17.5962], to: [-3.25, 0.0, -18.6292], radius: 1.2}
      - {kind: rod, from: [-3.25, 0.0, -18.6292], to: [-1.6823, 0.0, -19.2785], radius: 1.2}
      - {kind: rod, from: [-1.6823, 0.0, -19.2785], to: [-0.0, 0.0, -19.5], radius: 1.2}
      - {kind: rod, from: [-0.0, 0.0, -19.5], to: [1.6823, 0.0, -19.2785], radius: 1.2}
      - {kind: rod, from: [1.6823, 0.0, -19.2785], to: [3.25, 0.0, -18.6292], radius: 1.2}
      - {kind: rod, from: [3.25, 0.0, -18.6292], to: [4.5962, 0.0, -17.5962], radius: 1.2}
      - {kind: rod, from: [4.5962, 0.0, -17.5962], to: [5.6292, 0.0, -16.25], radius: 1.2}
      - {kind: rod, from: [5.6292, 0.0, -16.25], to: [6.2785, 0.0, -14.6823], radius: 1.2}
      - {kind: rod, from: [6.2785, 0.0, -14.6823], to: [6.5, 0.0, -13.0], radius: 1.2}
      - {kind: rod, from: [-6.5, 0, -13.0], to: [-6.5, 0, -11.0], radius: 1.2}   # the left leg
      - {kind: rod, from: [-6.5, 0, -11.0], to: [-6.5, 0, -0.8], radius: 1.0}   # its screw's core
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      - {kind: loft, a: [[-6.975, 0.8227, -4.5417], [-6.975, 0.8227, -3.5917], [-7.3, 1.3856, -3.9167], [-7.3, 1.3856, -4.2167]], b: [[-7.1718, 0.6718, -4.475], [-7.1718, 0.6718, -3.525], [-7.6314, 1.1314, -3.85], [-7.6314, 1.1314, -4.15]], collide: 1}
      - {kind: loft, a: [[-7.1718, 0.6718, -4.475], [-7.1718, 0.6718, -3.525], [-7.6314, 1.1314, -3.85], [-7.6314, 1.1314, -4.15]], b: [[-7.3227, 0.475, -4.4083], [-7.3227, 0.475, -3.4583], [-7.8856, 0.8, -3.7833], [-7.8856, 0.8, -4.0833]], collide: 1}
      - {kind: loft, a: [[-7.3227, 0.475, -4.4083], [-7.3227, 0.475, -3.4583], [-7.8856, 0.8, -3.7833], [-7.8856, 0.8, -4.0833]], b: [[-7.4176, 0.2459, -4.3417], [-7.4176, 0.2459, -3.3917], [-8.0455, 0.4141, -3.7167], [-8.0455, 0.4141, -4.0167]], collide: 1}
      - {kind: loft, a: [[-7.4176, 0.2459, -4.3417], [-7.4176, 0.2459, -3.3917], [-8.0455, 0.4141, -3.7167], [-8.0455, 0.4141, -4.0167]], b: [[-7.45, -0.0, -4.275], [-7.45, -0.0, -3.325], [-8.1, -0.0, -3.65], [-8.1, -0.0, -3.95]], collide: 1}
      - {kind: loft, a: [[-7.45, -0.0, -4.275], [-7.45, -0.0, -3.325], [-8.1, -0.0, -3.65], [-8.1, -0.0, -3.95]], b: [[-7.4176, -0.2459, -4.2083], [-7.4176, -0.2459, -3.2583], [-8.0455, -0.4141, -3.5833], [-8.0455, -0.4141, -3.8833]], collide: 1}
      - {kind: loft, a: [[-7.4176, -0.2459, -4.2083], [-7.4176, -0.2459, -3.2583], [-8.0455, -0.4141, -3.5833], [-8.0455, -0.4141, -3.8833]], b: [[-7.3227, -0.475, -4.1417], [-7.3227, -0.475, -3.1917], [-7.8856, -0.8, -3.5167], [-7.8856, -0.8, -3.8167]], collide: 1}
      - {kind: loft, a: [[-7.3227, -0.475, -4.1417], [-7.3227, -0.475, -3.1917], [-7.8856, -0.8, -3.5167], [-7.8856, -0.8, -3.8167]], b: [[-7.1718, -0.6718, -4.075], [-7.1718, -0.6718, -3.125], [-7.6314, -1.1314, -3.45], [-7.6314, -1.1314, -3.75]], collide: 1}
      - {kind: loft, a: [[-7.1718, -0.6718, -4.075], [-7.1718, -0.6718, -3.125], [-7.6314, -1.1314, -3.45], [-7.6314, -1.1314, -3.75]], b: [[-6.975, -0.8227, -4.0083], [-6.975, -0.8227, -3.0583], [-7.3, -1.3856, -3.3833], [-7.3, -1.3856, -3.6833]], collide: 1}
      - {kind: loft, a: [[-6.975, -0.8227, -4.0083], [-6.975, -0.8227, -3.0583], [-7.3, -1.3856, -3.3833], [-7.3, -1.3856, -3.6833]], b: [[-6.7459, -0.9176, -3.9417], [-6.7459, -0.9176, -2.9917], [-6.9141, -1.5455, -3.3167], [-6.9141, -1.5455, -3.6167]], collide: 1}
      - {kind: loft, a: [[-6.7459, -0.9176, -3.9417], [-6.7459, -0.9176, -2.9917], [-6.9141, -1.5455, -3.3167], [-6.9141, -1.5455, -3.6167]], b: [[-6.5, -0.95, -3.875], [-6.5, -0.95, -2.925], [-6.5, -1.6, -3.25], [-6.5, -1.6, -3.55]], collide: 1}
      - {kind: loft, a: [[-6.5, -0.95, -3.875], [-6.5, -0.95, -2.925], [-6.5, -1.6, -3.25], [-6.5, -1.6, -3.55]], b: [[-6.2541, -0.9176, -3.8083], [-6.2541, -0.9176, -2.8583], [-6.0859, -1.5455, -3.1833], [-6.0859, -1.5455, -3.4833]], collide: 1}
      - {kind: loft, a: [[-6.2541, -0.9176, -3.8083], [-6.2541, -0.9176, -2.8583], [-6.0859, -1.5455, -3.1833], [-6.0859, -1.5455, -3.4833]], b: [[-6.025, -0.8227, -3.7417], [-6.025, -0.8227, -2.7917], [-5.7, -1.3856, -3.1167], [-5.7, -1.3856, -3.4167]], collide: 1}
      - {kind: loft, a: [[-6.025, -0.8227, -3.7417], [-6.025, -0.8227, -2.7917], [-5.7, -1.3856, -3.1167], [-5.7, -1.3856, -3.4167]], b: [[-5.8282, -0.6718, -3.675], [-5.8282, -0.6718, -2.725], [-5.3686, -1.1314, -3.05], [-5.3686, -1.1314, -3.35]], collide: 1}
      - {kind: loft, a: [[-5.8282, -0.6718, -3.675], [-5.8282, -0.6718, -2.725], [-5.3686, -1.1314, -3.05], [-5.3686, -1.1314, -3.35]], b: [[-5.6773, -0.475, -3.6083], [-5.6773, -0.475, -2.6583], [-5.1144, -0.8, -2.9833], [-5.1144, -0.8, -3.2833]], collide: 1}
      - {kind: loft, a: [[-5.6773, -0.475, -3.6083], [-5.6773, -0.475, -2.6583], [-5.1144, -0.8, -2.9833], [-5.1144, -0.8, -3.2833]], b: [[-5.5824, -0.2459, -3.5417], [-5.5824, -0.2459, -2.5917], [-4.9545, -0.4141, -2.9167], [-4.9545, -0.4141, -3.2167]], collide: 1}
      - {kind: loft, a: [[-5.5824, -0.2459, -3.5417], [-5.5824, -0.2459, -2.5917], [-4.9545, -0.4141, -2.9167], [-4.9545, -0.4141, -3.2167]], b: [[-5.55, -0.0, -3.475], [-5.55, -0.0, -2.525], [-4.9, -0.0, -2.85], [-4.9, -0.0, -3.15]], collide: 1}
      - {kind: loft, a: [[-5.55, -0.0, -3.475], [-5.55, -0.0, -2.525], [-4.9, -0.0, -2.85], [-4.9, -0.0, -3.15]], b: [[-5.5824, 0.2459, -3.4083], [-5.5824, 0.2459, -2.4583], [-4.9545, 0.4141, -2.7833], [-4.9545, 0.4141, -3.0833]], collide: 1}
      - {kind: loft, a: [[-5.5824, 0.2459, -3.4083], [-5.5824, 0.2459, -2.4583], [-4.9545, 0.4141, -2.7833], [-4.9545, 0.4141, -3.0833]], b: [[-5.6773, 0.475, -3.3417], [-5.6773, 0.475, -2.3917], [-5.1144, 0.8, -2.7167], [-5.1144, 0.8, -3.0167]], collide: 1}
      - {kind: loft, a: [[-5.6773, 0.475, -3.3417], [-5.6773, 0.475, -2.3917], [-5.1144, 0.8, -2.7167], [-5.1144, 0.8, -3.0167]], b: [[-5.8282, 0.6718, -3.275], [-5.8282, 0.6718, -2.325], [-5.3686, 1.1314, -2.65], [-5.3686, 1.1314, -2.95]], collide: 1}
      - {kind: loft, a: [[-5.8282, 0.6718, -3.275], [-5.8282, 0.6718, -2.325], [-5.3686, 1.1314, -2.65], [-5.3686, 1.1314, -2.95]], b: [[-6.025, 0.8227, -3.2083], [-6.025, 0.8227, -2.2583], [-5.7, 1.3856, -2.5833], [-5.7, 1.3856, -2.8833]], collide: 1}
      - {kind: loft, a: [[-6.025, 0.8227, -3.2083], [-6.025, 0.8227, -2.2583], [-5.7, 1.3856, -2.5833], [-5.7, 1.3856, -2.8833]], b: [[-6.2541, 0.9176, -3.1417], [-6.2541, 0.9176, -2.1917], [-6.0859, 1.5455, -2.5167], [-6.0859, 1.5455, -2.8167]], collide: 1}
      - {kind: loft, a: [[-6.2541, 0.9176, -3.1417], [-6.2541, 0.9176, -2.1917], [-6.0859, 1.5455, -2.5167], [-6.0859, 1.5455, -2.8167]], b: [[-6.5, 0.95, -3.075], [-6.5, 0.95, -2.125], [-6.5, 1.6, -2.45], [-6.5, 1.6, -2.75]], collide: 1}
      - {kind: loft, a: [[-6.5, 0.95, -3.075], [-6.5, 0.95, -2.125], [-6.5, 1.6, -2.45], [-6.5, 1.6, -2.75]], b: [[-6.7459, 0.9176, -3.0083], [-6.7459, 0.9176, -2.0583], [-6.9141, 1.5455, -2.3833], [-6.9141, 1.5455, -2.6833]], collide: 1}
      - {kind: loft, a: [[-6.7459, 0.9176, -3.0083], [-6.7459, 0.9176, -2.0583], [-6.9141, 1.5455, -2.3833], [-6.9141, 1.5455, -2.6833]], b: [[-6.975, 0.8227, -2.9417], [-6.975, 0.8227, -1.9917], [-7.3, 1.3856, -2.3167], [-7.3, 1.3856, -2.6167]], collide: 1}
      - {kind: loft, a: [[-6.975, 0.8227, -2.9417], [-6.975, 0.8227, -1.9917], [-7.3, 1.3856, -2.3167], [-7.3, 1.3856, -2.6167]], b: [[-7.1718, 0.6718, -2.875], [-7.1718, 0.6718, -1.925], [-7.6314, 1.1314, -2.25], [-7.6314, 1.1314, -2.55]], collide: 1}
      - {kind: loft, a: [[-7.1718, 0.6718, -2.875], [-7.1718, 0.6718, -1.925], [-7.6314, 1.1314, -2.25], [-7.6314, 1.1314, -2.55]], b: [[-7.3227, 0.475, -2.8083], [-7.3227, 0.475, -1.8583], [-7.8856, 0.8, -2.1833], [-7.8856, 0.8, -2.4833]], collide: 1}
      - {kind: loft, a: [[-7.3227, 0.475, -2.8083], [-7.3227, 0.475, -1.8583], [-7.8856, 0.8, -2.1833], [-7.8856, 0.8, -2.4833]], b: [[-7.4176, 0.2459, -2.7417], [-7.4176, 0.2459, -1.7917], [-8.0455, 0.4141, -2.1167], [-8.0455, 0.4141, -2.4167]], collide: 1}
      - {kind: loft, a: [[-7.4176, 0.2459, -2.7417], [-7.4176, 0.2459, -1.7917], [-8.0455, 0.4141, -2.1167], [-8.0455, 0.4141, -2.4167]], b: [[-7.45, -0.0, -2.675], [-7.45, -0.0, -1.725], [-8.1, -0.0, -2.05], [-8.1, -0.0, -2.35]], collide: 1}
      - {kind: loft, a: [[-7.45, -0.0, -2.675], [-7.45, -0.0, -1.725], [-8.1, -0.0, -2.05], [-8.1, -0.0, -2.35]], b: [[-7.4176, -0.2459, -2.6083], [-7.4176, -0.2459, -1.6583], [-8.0455, -0.4141, -1.9833], [-8.0455, -0.4141, -2.2833]], collide: 1}
      - {kind: loft, a: [[-7.4176, -0.2459, -2.6083], [-7.4176, -0.2459, -1.6583], [-8.0455, -0.4141, -1.9833], [-8.0455, -0.4141, -2.2833]], b: [[-7.3227, -0.475, -2.5417], [-7.3227, -0.475, -1.5917], [-7.8856, -0.8, -1.9167], [-7.8856, -0.8, -2.2167]], collide: 1}
      - {kind: loft, a: [[-7.3227, -0.475, -2.5417], [-7.3227, -0.475, -1.5917], [-7.8856, -0.8, -1.9167], [-7.8856, -0.8, -2.2167]], b: [[-7.1718, -0.6718, -2.475], [-7.1718, -0.6718, -1.525], [-7.6314, -1.1314, -1.85], [-7.6314, -1.1314, -2.15]], collide: 1}
      - {kind: loft, a: [[-7.1718, -0.6718, -2.475], [-7.1718, -0.6718, -1.525], [-7.6314, -1.1314, -1.85], [-7.6314, -1.1314, -2.15]], b: [[-6.975, -0.8227, -2.4083], [-6.975, -0.8227, -1.4583], [-7.3, -1.3856, -1.7833], [-7.3, -1.3856, -2.0833]], collide: 1}
      - {kind: loft, a: [[-6.975, -0.8227, -2.4083], [-6.975, -0.8227, -1.4583], [-7.3, -1.3856, -1.7833], [-7.3, -1.3856, -2.0833]], b: [[-6.7459, -0.9176, -2.3417], [-6.7459, -0.9176, -1.3917], [-6.9141, -1.5455, -1.7167], [-6.9141, -1.5455, -2.0167]], collide: 1}
      - {kind: loft, a: [[-6.7459, -0.9176, -2.3417], [-6.7459, -0.9176, -1.3917], [-6.9141, -1.5455, -1.7167], [-6.9141, -1.5455, -2.0167]], b: [[-6.5, -0.95, -2.275], [-6.5, -0.95, -1.325], [-6.5, -1.6, -1.65], [-6.5, -1.6, -1.95]], collide: 1}
      - {kind: loft, a: [[-6.5, -0.95, -2.275], [-6.5, -0.95, -1.325], [-6.5, -1.6, -1.65], [-6.5, -1.6, -1.95]], b: [[-6.2541, -0.9176, -2.2083], [-6.2541, -0.9176, -1.2583], [-6.0859, -1.5455, -1.5833], [-6.0859, -1.5455, -1.8833]], collide: 1}
      - {kind: loft, a: [[-6.2541, -0.9176, -2.2083], [-6.2541, -0.9176, -1.2583], [-6.0859, -1.5455, -1.5833], [-6.0859, -1.5455, -1.8833]], b: [[-6.025, -0.8227, -2.1417], [-6.025, -0.8227, -1.1917], [-5.7, -1.3856, -1.5167], [-5.7, -1.3856, -1.8167]], collide: 1}
      - {kind: loft, a: [[-6.025, -0.8227, -2.1417], [-6.025, -0.8227, -1.1917], [-5.7, -1.3856, -1.5167], [-5.7, -1.3856, -1.8167]], b: [[-5.8282, -0.6718, -2.075], [-5.8282, -0.6718, -1.125], [-5.3686, -1.1314, -1.45], [-5.3686, -1.1314, -1.75]], collide: 1}
      - {kind: loft, a: [[-5.8282, -0.6718, -2.075], [-5.8282, -0.6718, -1.125], [-5.3686, -1.1314, -1.45], [-5.3686, -1.1314, -1.75]], b: [[-5.6773, -0.475, -2.0083], [-5.6773, -0.475, -1.0583], [-5.1144, -0.8, -1.3833], [-5.1144, -0.8, -1.6833]], collide: 1}
      - {kind: loft, a: [[-5.6773, -0.475, -2.0083], [-5.6773, -0.475, -1.0583], [-5.1144, -0.8, -1.3833], [-5.1144, -0.8, -1.6833]], b: [[-5.5824, -0.2459, -1.9417], [-5.5824, -0.2459, -0.9917], [-4.9545, -0.4141, -1.3167], [-4.9545, -0.4141, -1.6167]], collide: 1}
      - {kind: loft, a: [[-5.5824, -0.2459, -1.9417], [-5.5824, -0.2459, -0.9917], [-4.9545, -0.4141, -1.3167], [-4.9545, -0.4141, -1.6167]], b: [[-5.55, -0.0, -1.875], [-5.55, -0.0, -0.925], [-4.9, -0.0, -1.25], [-4.9, -0.0, -1.55]], collide: 1}
      - {kind: loft, a: [[-5.55, -0.0, -1.875], [-5.55, -0.0, -0.925], [-4.9, -0.0, -1.25], [-4.9, -0.0, -1.55]], b: [[-5.5824, 0.2459, -1.8083], [-5.5824, 0.2459, -0.8583], [-4.9545, 0.4141, -1.1833], [-4.9545, 0.4141, -1.4833]], collide: 1}
      - {kind: loft, a: [[-5.5824, 0.2459, -1.8083], [-5.5824, 0.2459, -0.8583], [-4.9545, 0.4141, -1.1833], [-4.9545, 0.4141, -1.4833]], b: [[-5.6773, 0.475, -1.7417], [-5.6773, 0.475, -0.7917], [-5.1144, 0.8, -1.1167], [-5.1144, 0.8, -1.4167]], collide: 1}
      - {kind: loft, a: [[-5.6773, 0.475, -1.7417], [-5.6773, 0.475, -0.7917], [-5.1144, 0.8, -1.1167], [-5.1144, 0.8, -1.4167]], b: [[-5.8282, 0.6718, -1.675], [-5.8282, 0.6718, -0.725], [-5.3686, 1.1314, -1.05], [-5.3686, 1.1314, -1.35]], collide: 1}
      - {kind: loft, a: [[-5.8282, 0.6718, -1.675], [-5.8282, 0.6718, -0.725], [-5.3686, 1.1314, -1.05], [-5.3686, 1.1314, -1.35]], b: [[-6.025, 0.8227, -1.6083], [-6.025, 0.8227, -0.6583], [-5.7, 1.3856, -0.9833], [-5.7, 1.3856, -1.2833]], collide: 1}
      - {kind: loft, a: [[-6.025, 0.8227, -1.6083], [-6.025, 0.8227, -0.6583], [-5.7, 1.3856, -0.9833], [-5.7, 1.3856, -1.2833]], b: [[-6.2541, 0.9176, -1.5417], [-6.2541, 0.9176, -0.5917], [-6.0859, 1.5455, -0.9167], [-6.0859, 1.5455, -1.2167]], collide: 1}
      - {kind: loft, a: [[-6.2541, 0.9176, -1.5417], [-6.2541, 0.9176, -0.5917], [-6.0859, 1.5455, -0.9167], [-6.0859, 1.5455, -1.2167]], b: [[-6.5, 0.95, -1.475], [-6.5, 0.95, -0.525], [-6.5, 1.6, -0.85], [-6.5, 1.6, -1.15]], collide: 1}
      - {kind: rod, from: [6.5, 0, -13.0], to: [6.5, 0, -9.3], radius: 1.2}   # the right leg
      - {kind: rod, from: [6.5, 0, -9.3], to: [6.5, 0, -5.2], radius: 0.7}   # its swivel neck
      - {kind: rod, from: [0, 0, -19.5], to: [0, 0, -22.5], radius: 0.8}   # the chain below (a stub)
  - id: rnut
    shape: part
    pos: [6.5, 0, 0]
    mount: lower
    density: 7800
    friction: 0.1
    color: "#c9bfa8"
    pieces:
      - {kind: poly, points: [[3.1, -7.0], [3.9, -7.0], [3.9, 7.0], [3.1, 7.0]], y: [-1.6, 1.6]}   # its side
      - {kind: poly, points: [[9.1, -7.0], [9.9, -7.0], [9.9, 7.0], [9.1, 7.0]], y: [-1.6, 1.6]}   # its side
      - {kind: poly, points: [[3.9, -7.0], [9.1, -7.0], [9.1, -4.5], [3.9, -4.5]], y: [-1.6, 1.6]}   # its lower end
      - {kind: poly, points: [[3.9, 3.8], [9.1, 3.8], [9.1, 7.0], [3.9, 7.0]], y: [-1.6, 1.6]}   # its upper end
      - {kind: rod, from: [6.5, 0, -4.6], to: [6.5, 0, -4.0], radius: 1.6}   # the knob it turns on
      - {kind: loft, a: [[5.8112, -1.663, 3.79], [5.8112, -1.663, 5.21], [6.0982, -0.9701, 4.835], [6.0982, -0.9701, 4.165]], b: [[6.2651, -1.7846, 3.8567], [6.2651, -1.7846, 5.2767], [6.3629, -1.041, 4.9017], [6.3629, -1.041, 4.2317]], collide: 2}
      - {kind: loft, a: [[6.2651, -1.7846, 3.8567], [6.2651, -1.7846, 5.2767], [6.3629, -1.041, 4.9017], [6.3629, -1.041, 4.2317]], b: [[6.7349, -1.7846, 3.9233], [6.7349, -1.7846, 5.3433], [6.6371, -1.041, 4.9683], [6.6371, -1.041, 4.2983]], collide: 2}
      - {kind: loft, a: [[6.7349, -1.7846, 3.9233], [6.7349, -1.7846, 5.3433], [6.6371, -1.041, 4.9683], [6.6371, -1.041, 4.2983]], b: [[7.1888, -1.663, 3.99], [7.1888, -1.663, 5.41], [6.9018, -0.9701, 5.035], [6.9018, -0.9701, 4.365]], collide: 2}
      - {kind: loft, a: [[7.1888, -1.663, 3.99], [7.1888, -1.663, 5.41], [6.9018, -0.9701, 5.035], [6.9018, -0.9701, 4.365]], b: [[7.5958, -1.428, 4.0567], [7.5958, -1.428, 5.4767], [7.1392, -0.833, 5.1017], [7.1392, -0.833, 4.4317]], collide: 2}
      - {kind: loft, a: [[7.5958, -1.428, 4.0567], [7.5958, -1.428, 5.4767], [7.1392, -0.833, 5.1017], [7.1392, -0.833, 4.4317]], b: [[7.928, -1.0958, 4.1233], [7.928, -1.0958, 5.5433], [7.333, -0.6392, 5.1683], [7.333, -0.6392, 4.4983]], collide: 2}
      - {kind: loft, a: [[7.928, -1.0958, 4.1233], [7.928, -1.0958, 5.5433], [7.333, -0.6392, 5.1683], [7.333, -0.6392, 4.4983]], b: [[8.163, -0.6888, 4.19], [8.163, -0.6888, 5.61], [7.4701, -0.4018, 5.235], [7.4701, -0.4018, 4.565]], collide: 2}
      - {kind: loft, a: [[8.163, -0.6888, 4.19], [8.163, -0.6888, 5.61], [7.4701, -0.4018, 5.235], [7.4701, -0.4018, 4.565]], b: [[8.2846, -0.2349, 4.2567], [8.2846, -0.2349, 5.6767], [7.541, -0.1371, 5.3017], [7.541, -0.1371, 4.6317]], collide: 2}
      - {kind: loft, a: [[8.2846, -0.2349, 4.2567], [8.2846, -0.2349, 5.6767], [7.541, -0.1371, 5.3017], [7.541, -0.1371, 4.6317]], b: [[8.2846, 0.2349, 4.3233], [8.2846, 0.2349, 5.7433], [7.541, 0.1371, 5.3683], [7.541, 0.1371, 4.6983]], collide: 2}
      - {kind: loft, a: [[8.2846, 0.2349, 4.3233], [8.2846, 0.2349, 5.7433], [7.541, 0.1371, 5.3683], [7.541, 0.1371, 4.6983]], b: [[8.163, 0.6888, 4.39], [8.163, 0.6888, 5.81], [7.4701, 0.4018, 5.435], [7.4701, 0.4018, 4.765]], collide: 2}
      - {kind: loft, a: [[8.163, 0.6888, 4.39], [8.163, 0.6888, 5.81], [7.4701, 0.4018, 5.435], [7.4701, 0.4018, 4.765]], b: [[7.928, 1.0958, 4.4567], [7.928, 1.0958, 5.8767], [7.333, 0.6392, 5.5017], [7.333, 0.6392, 4.8317]], collide: 2}
      - {kind: loft, a: [[7.928, 1.0958, 4.4567], [7.928, 1.0958, 5.8767], [7.333, 0.6392, 5.5017], [7.333, 0.6392, 4.8317]], b: [[7.5958, 1.428, 4.5233], [7.5958, 1.428, 5.9433], [7.1392, 0.833, 5.5683], [7.1392, 0.833, 4.8983]], collide: 2}
      - {kind: loft, a: [[7.5958, 1.428, 4.5233], [7.5958, 1.428, 5.9433], [7.1392, 0.833, 5.5683], [7.1392, 0.833, 4.8983]], b: [[7.1888, 1.663, 4.59], [7.1888, 1.663, 6.01], [6.9018, 0.9701, 5.635], [6.9018, 0.9701, 4.965]], collide: 2}
      - {kind: loft, a: [[7.1888, 1.663, 4.59], [7.1888, 1.663, 6.01], [6.9018, 0.9701, 5.635], [6.9018, 0.9701, 4.965]], b: [[6.7349, 1.7846, 4.6567], [6.7349, 1.7846, 6.0767], [6.6371, 1.041, 5.7017], [6.6371, 1.041, 5.0317]], collide: 2}
      - {kind: loft, a: [[6.7349, 1.7846, 4.6567], [6.7349, 1.7846, 6.0767], [6.6371, 1.041, 5.7017], [6.6371, 1.041, 5.0317]], b: [[6.2651, 1.7846, 4.7233], [6.2651, 1.7846, 6.1433], [6.3629, 1.041, 5.7683], [6.3629, 1.041, 5.0983]], collide: 2}
      - {kind: loft, a: [[6.2651, 1.7846, 4.7233], [6.2651, 1.7846, 6.1433], [6.3629, 1.041, 5.7683], [6.3629, 1.041, 5.0983]], b: [[5.8112, 1.663, 4.79], [5.8112, 1.663, 6.21], [6.0982, 0.9701, 5.835], [6.0982, 0.9701, 5.165]], collide: 2}
      - {kind: loft, a: [[5.8112, 1.663, 4.79], [5.8112, 1.663, 6.21], [6.0982, 0.9701, 5.835], [6.0982, 0.9701, 5.165]], b: [[5.4042, 1.428, 4.8567], [5.4042, 1.428, 6.2767], [5.8608, 0.833, 5.9017], [5.8608, 0.833, 5.2317]], collide: 2}
      - {kind: loft, a: [[5.4042, 1.428, 4.8567], [5.4042, 1.428, 6.2767], [5.8608, 0.833, 5.9017], [5.8608, 0.833, 5.2317]], b: [[5.072, 1.0958, 4.9233], [5.072, 1.0958, 6.3433], [5.667, 0.6392, 5.9683], [5.667, 0.6392, 5.2983]], collide: 2}
      - {kind: loft, a: [[5.072, 1.0958, 4.9233], [5.072, 1.0958, 6.3433], [5.667, 0.6392, 5.9683], [5.667, 0.6392, 5.2983]], b: [[4.837, 0.6888, 4.99], [4.837, 0.6888, 6.41], [5.5299, 0.4018, 6.035], [5.5299, 0.4018, 5.365]], collide: 2}
      - {kind: loft, a: [[4.837, 0.6888, 4.99], [4.837, 0.6888, 6.41], [5.5299, 0.4018, 6.035], [5.5299, 0.4018, 5.365]], b: [[4.7154, 0.2349, 5.0567], [4.7154, 0.2349, 6.4767], [5.459, 0.1371, 6.1017], [5.459, 0.1371, 5.4317]], collide: 2}
      - {kind: loft, a: [[4.7154, 0.2349, 5.0567], [4.7154, 0.2349, 6.4767], [5.459, 0.1371, 6.1017], [5.459, 0.1371, 5.4317]], b: [[4.7154, -0.2349, 5.1233], [4.7154, -0.2349, 6.5433], [5.459, -0.1371, 6.1683], [5.459, -0.1371, 5.4983]], collide: 2}
      - {kind: loft, a: [[4.7154, -0.2349, 5.1233], [4.7154, -0.2349, 6.5433], [5.459, -0.1371, 6.1683], [5.459, -0.1371, 5.4983]], b: [[4.837, -0.6888, 5.19], [4.837, -0.6888, 6.61], [5.5299, -0.4018, 6.235], [5.5299, -0.4018, 5.565]], collide: 2}
      - {kind: loft, a: [[4.837, -0.6888, 5.19], [4.837, -0.6888, 6.61], [5.5299, -0.4018, 6.235], [5.5299, -0.4018, 5.565]], b: [[5.072, -1.0958, 5.2567], [5.072, -1.0958, 6.6767], [5.667, -0.6392, 6.3017], [5.667, -0.6392, 5.6317]], collide: 2}
      - {kind: loft, a: [[5.072, -1.0958, 5.2567], [5.072, -1.0958, 6.6767], [5.667, -0.6392, 6.3017], [5.667, -0.6392, 5.6317]], b: [[5.4042, -1.428, 5.3233], [5.4042, -1.428, 6.7433], [5.8608, -0.833, 6.3683], [5.8608, -0.833, 5.6983]], collide: 2}
      - {kind: loft, a: [[5.4042, -1.428, 5.3233], [5.4042, -1.428, 6.7433], [5.8608, -0.833, 6.3683], [5.8608, -0.833, 5.6983]], b: [[5.8112, -1.663, 5.39], [5.8112, -1.663, 6.81], [6.0982, -0.9701, 6.435], [6.0982, -0.9701, 5.765]], collide: 2}
      - {kind: loft, a: [[5.8112, -1.663, 5.39], [5.8112, -1.663, 6.81], [6.0982, -0.9701, 6.435], [6.0982, -0.9701, 5.765]], b: [[6.2651, -1.7846, 5.4567], [6.2651, -1.7846, 6.8767], [6.3629, -1.041, 6.5017], [6.3629, -1.041, 5.8317]], collide: 2}
      - {kind: loft, a: [[6.2651, -1.7846, 5.4567], [6.2651, -1.7846, 6.8767], [6.3629, -1.041, 6.5017], [6.3629, -1.041, 5.8317]], b: [[6.7349, -1.7846, 5.5233], [6.7349, -1.7846, 6.9433], [6.6371, -1.041, 6.5683], [6.6371, -1.041, 5.8983]], collide: 2}
      - {kind: loft, a: [[6.7349, -1.7846, 5.5233], [6.7349, -1.7846, 6.9433], [6.6371, -1.041, 6.5683], [6.6371, -1.041, 5.8983]], b: [[7.1888, -1.663, 5.59], [7.1888, -1.663, 7.01], [6.9018, -0.9701, 6.635], [6.9018, -0.9701, 5.965]], collide: 2}
      - {kind: loft, a: [[7.1888, -1.663, 5.59], [7.1888, -1.663, 7.01], [6.9018, -0.9701, 6.635], [6.9018, -0.9701, 5.965]], b: [[7.5958, -1.428, 5.6567], [7.5958, -1.428, 7.0767], [7.1392, -0.833, 6.7017], [7.1392, -0.833, 6.0317]], collide: 2}
      - {kind: loft, a: [[7.5958, -1.428, 5.6567], [7.5958, -1.428, 7.0767], [7.1392, -0.833, 6.7017], [7.1392, -0.833, 6.0317]], b: [[7.928, -1.0958, 5.7233], [7.928, -1.0958, 7.1433], [7.333, -0.6392, 6.7683], [7.333, -0.6392, 6.0983]], collide: 2}
      - {kind: loft, a: [[7.928, -1.0958, 5.7233], [7.928, -1.0958, 7.1433], [7.333, -0.6392, 6.7683], [7.333, -0.6392, 6.0983]], b: [[8.163, -0.6888, 5.79], [8.163, -0.6888, 7.21], [7.4701, -0.4018, 6.835], [7.4701, -0.4018, 6.165]], collide: 2}
      - {kind: loft, a: [[8.163, -0.6888, 5.79], [8.163, -0.6888, 7.21], [7.4701, -0.4018, 6.835], [7.4701, -0.4018, 6.165]], b: [[8.2846, -0.2349, 5.8567], [8.2846, -0.2349, 7.2767], [7.541, -0.1371, 6.9017], [7.541, -0.1371, 6.2317]], collide: 2}
      - {kind: loft, a: [[8.2846, -0.2349, 5.8567], [8.2846, -0.2349, 7.2767], [7.541, -0.1371, 6.9017], [7.541, -0.1371, 6.2317]], b: [[8.2846, 0.2349, 5.9233], [8.2846, 0.2349, 7.3433], [7.541, 0.1371, 6.9683], [7.541, 0.1371, 6.2983]], collide: 2}
      - {kind: loft, a: [[8.2846, 0.2349, 5.9233], [8.2846, 0.2349, 7.3433], [7.541, 0.1371, 6.9683], [7.541, 0.1371, 6.2983]], b: [[8.163, 0.6888, 5.99], [8.163, 0.6888, 7.41], [7.4701, 0.4018, 7.035], [7.4701, 0.4018, 6.365]], collide: 2}
      - {kind: loft, a: [[8.163, 0.6888, 5.99], [8.163, 0.6888, 7.41], [7.4701, 0.4018, 7.035], [7.4701, 0.4018, 6.365]], b: [[7.928, 1.0958, 6.0567], [7.928, 1.0958, 7.4767], [7.333, 0.6392, 7.1017], [7.333, 0.6392, 6.4317]], collide: 2}
      - {kind: loft, a: [[7.928, 1.0958, 6.0567], [7.928, 1.0958, 7.4767], [7.333, 0.6392, 7.1017], [7.333, 0.6392, 6.4317]], b: [[7.5958, 1.428, 6.1233], [7.5958, 1.428, 7.5433], [7.1392, 0.833, 7.1683], [7.1392, 0.833, 6.4983]], collide: 2}
      - {kind: loft, a: [[7.5958, 1.428, 6.1233], [7.5958, 1.428, 7.5433], [7.1392, 0.833, 7.1683], [7.1392, 0.833, 6.4983]], b: [[7.1888, 1.663, 6.19], [7.1888, 1.663, 7.61], [6.9018, 0.9701, 7.235], [6.9018, 0.9701, 6.565]], collide: 2}
      - {kind: loft, a: [[7.1888, 1.663, 6.19], [7.1888, 1.663, 7.61], [6.9018, 0.9701, 7.235], [6.9018, 0.9701, 6.565]], b: [[6.7349, 1.7846, 6.2567], [6.7349, 1.7846, 7.6767], [6.6371, 1.041, 7.3017], [6.6371, 1.041, 6.6317]], collide: 2}
      - {kind: loft, a: [[6.7349, 1.7846, 6.2567], [6.7349, 1.7846, 7.6767], [6.6371, 1.041, 7.3017], [6.6371, 1.041, 6.6317]], b: [[6.2651, 1.7846, 6.3233], [6.2651, 1.7846, 7.7433], [6.3629, 1.041, 7.3683], [6.3629, 1.041, 6.6983]], collide: 2}
      - {kind: loft, a: [[6.2651, 1.7846, 6.3233], [6.2651, 1.7846, 7.7433], [6.3629, 1.041, 7.3683], [6.3629, 1.041, 6.6983]], b: [[5.8112, 1.663, 6.39], [5.8112, 1.663, 7.81], [6.0982, 0.9701, 7.435], [6.0982, 0.9701, 6.765]], collide: 2}
      - {kind: loft, a: [[5.8112, 1.663, 6.39], [5.8112, 1.663, 7.81], [6.0982, 0.9701, 7.435], [6.0982, 0.9701, 6.765]], b: [[5.4042, 1.428, 6.4567], [5.4042, 1.428, 7.8767], [5.8608, 0.833, 7.5017], [5.8608, 0.833, 6.8317]], collide: 2}
      - {kind: loft, a: [[5.4042, 1.428, 6.4567], [5.4042, 1.428, 7.8767], [5.8608, 0.833, 7.5017], [5.8608, 0.833, 6.8317]], b: [[5.072, 1.0958, 6.5233], [5.072, 1.0958, 7.9433], [5.667, 0.6392, 7.5683], [5.667, 0.6392, 6.8983]], collide: 2}
      - {kind: loft, a: [[5.072, 1.0958, 6.5233], [5.072, 1.0958, 7.9433], [5.667, 0.6392, 7.5683], [5.667, 0.6392, 6.8983]], b: [[4.837, 0.6888, 6.59], [4.837, 0.6888, 8.01], [5.5299, 0.4018, 7.635], [5.5299, 0.4018, 6.965]], collide: 2}
      - {kind: loft, a: [[4.837, 0.6888, 6.59], [4.837, 0.6888, 8.01], [5.5299, 0.4018, 7.635], [5.5299, 0.4018, 6.965]], b: [[4.7154, 0.2349, 6.6567], [4.7154, 0.2349, 8.0767], [5.459, 0.1371, 7.7017], [5.459, 0.1371, 7.0317]], collide: 2}
      - {kind: loft, a: [[4.7154, 0.2349, 6.6567], [4.7154, 0.2349, 8.0767], [5.459, 0.1371, 7.7017], [5.459, 0.1371, 7.0317]], b: [[4.7154, -0.2349, 6.7233], [4.7154, -0.2349, 8.1433], [5.459, -0.1371, 7.7683], [5.459, -0.1371, 7.0983]], collide: 2}
      - {kind: loft, a: [[4.7154, -0.2349, 6.7233], [4.7154, -0.2349, 8.1433], [5.459, -0.1371, 7.7683], [5.459, -0.1371, 7.0983]], b: [[4.837, -0.6888, 6.79], [4.837, -0.6888, 8.21], [5.5299, -0.4018, 7.835], [5.5299, -0.4018, 7.165]], collide: 2}
      - {kind: loft, a: [[4.837, -0.6888, 6.79], [4.837, -0.6888, 8.21], [5.5299, -0.4018, 7.835], [5.5299, -0.4018, 7.165]], b: [[5.072, -1.0958, 6.8567], [5.072, -1.0958, 8.2767], [5.667, -0.6392, 7.9017], [5.667, -0.6392, 7.2317]], collide: 2}
      - {kind: loft, a: [[5.072, -1.0958, 6.8567], [5.072, -1.0958, 8.2767], [5.667, -0.6392, 7.9017], [5.667, -0.6392, 7.2317]], b: [[5.4042, -1.428, 6.9233], [5.4042, -1.428, 8.3433], [5.8608, -0.833, 7.9683], [5.8608, -0.833, 7.2983]], collide: 2}
      - {kind: loft, a: [[5.4042, -1.428, 6.9233], [5.4042, -1.428, 8.3433], [5.8608, -0.833, 7.9683], [5.8608, -0.833, 7.2983]], b: [[5.8112, -1.663, 6.99], [5.8112, -1.663, 8.41], [6.0982, -0.9701, 8.035], [6.0982, -0.9701, 7.365]], collide: 2}
joints:
  - {id: j_n, type: hinge, body: lnut, axis: [0, 0, 1], damping: 0.002}   # the left swivel nut, turned by the spanner: the one driven joint
  - {id: j_z, type: slide, body: lower, axis: [0, 0, 1], range: [-0.05, 4.5], damping: 0.05}   # the lower half (hanging in the chain); + : up
  - {id: j_r, type: hinge, body: rnut, axis: [0, 0, 1], damping: 0.0005}   # the right swivel nut, free on its knob
driver: {joint: j_n, kind: velocity, rpm: -12, kv: 0.3, max_torque: 5}
checks:
  - {type: follow, out: j_z, in: j_n, expect: -0.002546, tol: 7.6e-05, min_r2: 0.999, settle_s: 1.0, window_s: 8.0}   # the lower half rises a pitch, 1.6 cm, a turn of the nut
  - {type: follow, out: j_r, in: j_n, expect: -1.0, tol: 0.03, min_r2: 0.999, settle_s: 1.0, window_s: 8.0}   # and the right nut is turned with it, the other way
  - {type: position, joint: j_z, min: -0.05, max: 3.5, settle_s: 0.5, window_s: 9}
  - {type: penetration, max: 0.002, settle_s: 0.5}
camera: {target: [0, 0, -6.0], position: [0, -100.0, -6.0], fov: 34}
display:
  output: j_z
  labels: {j_n: "Left swivel nut (driver)", j_z: "Lower half", j_r: "Right swivel nut"}
  proof: {label: "Threads out of contact", sub: "the nut turns but the lower half stays down"}