Balance weight for fidget spinner

The design itself is hardly worth discussing: a simple cylinder sized to fit in a 608 bearing. But the reason for it is a little interesting.

I noticed my printed spinner had a pronounced vibration at certain speeds. Using an ungreased ceramic bearing, it had a tendency to turn the same side down when held vertically. I weighed the mass bearings with a [centigram scale](https://www.amazon.com/gp/product/B003O5K3JQ) ($14 on Amazon) and found that the heaviest one was nearly .3g more than the l