After a couple weeks waiting for this part to arrive, it was time to tackle this again. In order to do this right this time, I purchased the single flute countersink cutter from Cleveland tool and did an extensive amount of research and practice. I kind of did this in two parts. First I used the 3 flute cutter on one side of the wedge in the drill press running at 300 rpm. I then flipped the piece over in the jig and used the single flute cutter in order to avoid chatter. I also needed to have the cutter pilot up against one of the edges in the jig so that it would not wobble around. After very slow and methodical cutting, I was left with a piece that is cut clean and looks good. What a pain.