[Michael Yeh]

Not having any of the Vex spacers on hand, we found that a 1/2" sch 40 PVC pipe fits loosely onto hex shaft. (0.622" nominal ID on .578" diagonal of the hex).

We didn't notice any issues with bearing spacing on the AM14U and 3CIM4U, but we'll double check when we get to Greater DC.

Also, clarification of "doesn't fully extend into the outer bearing" - the shaft from the plastic default box does ride on the outer bearing, just not all the way through so I assume the shafts are the same.