[Andy Brockway]

We use bushings for most of our low speed mechanisms. One of our sponsors is a hardware store and have quite a supply. If you do use them in low speed mechanisms, you still need to oil them initially. The oil impregnation migrates to the surface under pressure and heat, slow motion may not provide enough heat.

I recommend ball bearings for high speed and your drive. Friction is your enemy here. Reducing friction with bearings will reduce the load to your motors and make your batteries last longer in a match.