pic: CAD exercise - 1640 Pivot Assembly with cut-away view of Pivot Module

[jspatz1]

I am very surprised that you did not have trouble with the cantilevered side-load on the Denso motor shaft. The worm gear in that motor is a plastic gear captured only by the thin sheetmetal lid on the housing, and is not designed for any side-load whatsoever. You might want to consider supporting the end of that sprocket if you can. We have found that a 5/8" OD ball bearing fits nicely into the center hole of the plastic Denso adapter to provide end support.
I very much like the chain reductions and overall design of your module. Very similar to our own.