Ideally they should not bind in the arms or the inserts. Rear arms this is easily achievable. Front arms are a different story. The drop screws binds the hinge pin. I gave up trying to ream it with my crappy Turdigy reamer. Someone posted earlier in this thread that slightly drilling out the droop screw hole before inserting the screw fixed the issue.

BTW, the stock grey hinge pins do bend easily on this buggy.