- Oct 23, 2011
You are probably right, also by my math the cup is too narrow: the outside is 2 1/8" with a 1/8" wall, meaning the ID is probably around 1 7/8". It will need some thinning out by the driver. It's pretty darn close, but yes, it will need modification. I'm guessing the hole in the back fo the cup is around 1.5", this bearing cup is 1". I have grinder bits, and can probably do it pretty easily and $2 plus a little work beats the hell out of $100 Jaben cups!