Hope this helps.

The vertical cylinder where the ropes go around has a diamter of 0.25 and a
height from < 0.0, 0.0, 0.0 > to < 0.0, 2.7, 0.0 >.

The arm separates from the middle of the cylinder#s height and has an own radius
of 0.2 there.

Excerpt:

 union // sling arm
 {
  cylinder { < 0.0, -0.2, 0.0 > < 0.0, 2.5, 0.0 > 0.25 texture { TopColor rotate
< 90.0, 0.0, 0.0 > } }
  cone { < 0.0,  1.15,  3.0 > 0.15 < 0.0, 1.15, 0.0 > 0.2 texture { TopColor } }
  box { < 0.0, 1.00,  3.0 > < 0.18, 1.30,  2.5 > texture { RustyIron } }
  cylinder { < 0.0, 1.15,  3.0 > < 0.0, 1.15,  2.9 > 0.17 texture { RustyIron }
}
  cylinder { < 0.0, 1.15,  2.7 > < 0.0, 1.15,  2.6 > 0.18 texture { RustyIron }
}
  torus { 0.15, 0.05 translate < 0.18, 1.15,  2.75 > texture { RustyIron } }
  sphere { < 0.0, 1.15,  3.0 > 0.15 texture { RustyIron } }
  torus { 0.05, 0.025 rotate < 90.0, 0.0, 0.0 > translate < 0.33, 1.15,  2.75 >
texture { Rope } } //  // ropes around rings
  cylinder { < 0.33, 1.15,  2.75 > < 4.19, 1.275,  3.7825 > 0.025 texture { Rope
} }
  rotate < 0.0, 55.0, 0.0 >
  translate < -1.5, 0.0,  1.32 >
 }
The first cylinder is the vertical one (rope skein), and the first cone is the
arm.

The ropes need to have a cross-section radius larger tan 0.025, maybe 0.030 or
0.035 maximum.

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