[LB7 (OP)]

Maybe I can do that:


At start:


dexx.png (54.26 kB . 1182x725 - viewed 2348 times)

At the end:


dui.png (19.33 kB . 1182x707 - viewed 2394 times)

When the device is deformed I have more torque on the right part than on the left. I can use different size of the half disks like that I have the barycenter of the white shape at the middle on the back arm (A4). Note, the white disks don't have any torque on them. Like always the blue color is spheres attracted from the green line. The white shape is empty. The black arm rotates around A3 when the device is deformed, the black arm has the same orientation than the lateral walls.

[Bored chemist]

What are you trying to achieve here?