[Chris is me]

Originally Posted by Michael Corsetto

The key was 2 bearings in the VP mount tube (one on each side of the tube), and then a third bearing on the other polycarb arm. This meant that, even as the arms twisted, the C-C for the chain was held constant. But since the polycarb arm is flexy, the intake shaft isn't over-constrained, even with three bearings (as it would be if all three bearings were held constant relative to each other).

Just to go on a tangent here, but any time you have a long shaft like this (>2 feet between supports), you can sometimes get away with more than two bearings per shaft since the span is so long. It's not something that can be only done with polycarbonate or anything like that, especially if 2 of your 3 bearings are in pockets milled into the same tube. Just another fun fact to add to the conversation here.