Used for some of the motors I installed on the microscope stand. The only thing is that for the central part of the stylus there is an ideal circle and not a stylus with a notch. As it's weird in slip theory you need precise almost solid pins for the gears to connect and hopefully they don't just slip from spur to spur I've seen this before to be honest where that The metal of the bolt is so tight that it's difficult to pull it out. I think this is a typical size, I glued plastic engine covers with an axle I made with a 3D printer to the appropriate holes.
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