[mcguyver]

I don't see much threadlock residue on that screw. It could have been a little light and when the motor sha got warm, it worked itself out.

Use lots, and use red.

I have never had to put any on a pinion, as Systema uses a good amount and you need a torch to loosen it. FCC should sell their motors with pinions installed, if the shaft is the correct length, then they can all be preset to the same position. Or pull the upper shim and make the armature adjustable.

Jay, you can pass that one along to FCC as well.