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Strandbeast motion problem

in Simulation
May I know, what's wrong with the joint?
https://cad.onshape.com/documents/cd23915d1a1ec75124bc8f2f/w/612cec551d2bfea6b477b8e8/e/9891485f435bfebec602bd34
0
Comments
The distance of holes in Part 9, or the the length in parts 4 or 5 is a bit off, creating an ambiguous situation that cannot be solved. The grey triangle (Part 2) kind of over-rotates. The same would happen in the real world.
In my version, I shortened Part 5 by 1 cm and that makes it work.