I was going to do the route of the build your own, but I started thinking about it and just bought an innovative personal spinner.
I ordered it on a wedneday and it was delivered on saturday (new years eve) so in between drinks I practiced resurfacing some older 16lb balls i no longer use. all i can say is wow. the ball track is gone, the tiny nicks and scrapes are gone, i wet sanded from the coarse grit up to 1000 on an old storm trauma, then polished it, and it looks awesome.