In addition to what drill bit to use, I may be wrong, but I think Tenpin wants to know how to weigh the ball on a dodo Scale and then after weighing it, how to determine if it has 1/2 or 1 or 1 1/2 etc. oz side weight or finger weight, etc. or whatever. I can't answer this, but hopefully someone will, as I would also like to know how to do this myself.