JimOregon
Magistrate
I think picture #4 is the best view of how that arrangement is supposed to work - bearing in mind that you can do lots of things in Poser that won't work in reality. Anyway, you can see in that picture that there are two ropes coiled around the winch that run over the top rung of the device and down to the girl's wrists. Then they tie her ankles in place below and crank up the tension on her arms and see what breaks first.
No, I was referring to the picture earlier posted by quest...showing the lady stretch bent backwards over a barrel looking device. Take a look.