Finally got around to start swapping out the plastic prototype parts with a metal one. Seems to not have much of any flex too it so the belt is likely not going to slip. Once I have all three done this should allow me to get the robot moving. Which will be nice. The bearing was not as press fit tight as I would like, but it is good enough. 

Yes that is a Raspberry Pi 5 water-cooled in the the background, also yes I know it does not need that much cooling. (but still fun)