[George C]

It's easy to grind a piece of HSS cutter stock to do the job. Keep your micrometer caliper handy and check the size often. The narrow piece only needs to be about 1/4" long. If you screw it up, grind it off and start over. I made one up yesterday by grinding down a piece of .100 parting tool because it was quicker than finding the one I made during build which is double ended - one for 1/2 and the other for 3/8. It took less than 5 minutes and when I was done, I just ground it back to square again. A LOT cheaper than buying a special holder and cutter.