Dumbbell weight plate bushing
thingiverse
A couple of my dumbbell bars came with rubber washers that had become hard and broken. This replacement part is designed to fit snugly onto the dumbbell threads and into the hole of the weight plate, eliminating any play when tightened down. Based on screw thread designs from Patola's star nut, this component relies on aubenc's polyScrewThread library, which has been duplicated here. It can be used as-is in the same directory or installed in one of the OpenSCAD library locations for convenient access.
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