for 685 bearing - Eibos Cyclops drive mechanism

Since I didn't have a 624 bearing at hand but plenty of 685's, I changed the wheel-thingy to make it fit.

The pin of the counterpart was a bit too loose for my taste, so I made is a whiff thicker and I changed the part for the M3 nut so that it is easier to remove the support if you use some.