I just bored them out to just shy of 1 inch and pressed in a tube of 304 that was one thou larger. Then bored the stainless to .875" ID. The hardest part was punching the ,040" hole through the sleeve via the reservoir. If you do it your self, take the time to make a square fixture that you can remove and replace accurately to the 4 jaw chuck. You will regret it, if you try to hold the MC with the 4 jaw 8^(
Randy