I have a massless part that is attached to another part via a hinge constraint. The massless part is able to move the other part with mass for some reason? Here is a video:
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What is rotating the Part in the video? A tool or the camera? What is the Density of the other Part?
I’d suggest trying to set the Hinge to Motor and set the AngularSpeed so that the Massless Part is rotating based off the HingeConstraint and nothing else. If the other Part still moves try increasing it’s Density.