- Joined
- Jun 22, 2016
- Messages
- 280
I just use a piece of note paper that is just less than .003 thick. It may get squished to less than that by the time everything is tightened. Gears seem to run fine, not noisy. I brush some grease on them. They run pretty slow so it would seem as long as they don't bind from being too tight, to being ridiculously loose the tooth form of a spur gear should work fine.