[Joe G.]

One thing to be aware of with laser cut bearing bores. Typically, the laser will leave a small burr on the edge of the hole at the entry/exit point. If left untouched, this burr will prevent the bearing from pressing in, or compress the outer race enough to inhibit the bearing's motion.

We send our sheet metal sponsor parts with bearing holes drawn as the nominal bearing diameter, and they press just right, maybe just a little loose, when this burr is removed. We always use rivets and washers as bearing retainers for some extra insurance, but in properly designed mechanisms, I think they'd be fine without them.