[Aren_Hill]

Originally Posted by Ice Berg

In the picture above, of the module with a blue wheel, I was wondering how those sprockets drive the shafts. It doesn't look too me like they're hex, or keyed.

Right behind that snapring you see is a 1/2" hex followed by a step of 1/2" round for a bearings then it steps down to 3/8" hex for the wheel then at the very end it turns into 3/8" round for another bearing and snapring.