Well before I "scored" my old SC fuse for my project I was going to scratch build the fuse and while contemplating advice to grind the notches I came up with an idea to do it with my 12" grizzly metal lathe. I had previously bought a "quick change" toolpost from Enco for it to mount on the compound and among the tool mounts it had with it was a boring tool holder. I think it handles up to 1" od tools. Anyway I made sleeve holders to fit 3/4, 5/8, and 1/2" tubing. Mount the correct hole saw in the headstock chuck, the tube in the holder, and swing the compound to the desired angle, lock then use the longitudinal feed to make a perfect cut. Takes way longer to describe than do. How do people live without a metal lathe anyway??If a person didn't want to buy a quick change (just do it you'll never regret it) you could make tubing holders out of wood bolted to the compound.