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Onshape Assembly - Using pneumatic to pivot around a fixed point.

Hi All!

New to Onshape assemblies and running into a challenge. I'm trying to model a pneumatic pushing the top of a "foot" while keeping the lower pin fixed.
The goal of this is to have the foot rotate around the fixed pin when the pneumatic pushes/pulls.

When I fix the lower pin, the whole assembly locks up, and if I don't fix the lower pin the foot is allowed to move with the pneumatic.

Any ideas how to get the foot to rotate about the lower pin so the pneumatic pushes?

Link to model: https://cad.onshape.com/documents/dcf694269f1bad06ef950650/w/e5f286c412f62e3b139c0b7a/e/a3cd4c30d42d35a98e7851b5?renderMode=0&uiState=631276c0058e6c0b821121d6



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