Dremel tools are very useful for a lot of things Highly recommend them.
(I sharpen my old lawnmower blade with it as the blade is stuck on.)
The bit I used was a ball shaped cutter so it went in nicely.
As for balance, I was careful to not take much away. Some did get removed as I closely watched the dust colour.
By and large though, the paint “chipped” off when scraped. They don’t use super adhesive paint for these dice as they are protected from direct impact.
The balance issue is less than drilling out one side for a pip.
Hopefully will get the green dice today and finish this project up.
Then back to finding a better storage solution for my 1942.2 game. :-(