auto-balancing bench grinder arbors

[mattthemuppet]

could be, although centripetal force (or lack of it) keeps them in place as far as I can tell once the grinder is up to speed. They only roll around on start up and just before the grinder finishes slowing down to a stop. I tried grease and it didn't let them move at all. I don't think oil would hurt but I don't think it's necessary either, plus the downsides of sealing it in as you said.

I'm getting some 3/16 balls tomorrow, just can't stop needing to itch that scratch and see if I can fully balance the wire wheel.