[MultipleParadox]

Thanks Jimski, I appreciate the input.
It makes sense, as some gears seemed to "need a lot of shims" O_o At least it was in my impression. I'll try to lower all that tonight.

I'm just wondering though: If I reduce the amount of shims, chances are the gears will have of a "lot" of side play I guess (perpendicular to the gear's shaft), I do I reduce that? Or is it not that bad to have some play like this?

Note: In the video, I think the spur gear only had a single shim, quite thin, and was still jamming like that. O_o