This is great. I love to see modded stock stuff.
The drill press on a round ball is great.
If your stuck with the 4 ball guide and not a ramp plate, he Ceramic balls from MC Mastercar have been great for tuning the 4 ball guide. I can’t remember but I think one is 1/2 or a little less than 1/2 the weight of a metal ball. So you have more capabilities to tune variation instead of just running two metal bearings.
This makes me want to mess with a stock Moby setup again. (edited)