I had promised a few pictures.
I have made a whole set of these cutters over the years. The hole in the center of the cork is always in the center.
Rings for a 10' 6" two-handed salmon rod. The small cut outs are used to make ferrule plugs. I have been known to use them as "bobicators". That is bobber for most of the fishing world and strike indicators for the fly fishing world.
This is the lathe bit I use for the first pass on my cork grips. The grips are so much easier to sand to shape when they are round to start with. The idea come from a wood auger bit with a spur that leads the cut as you bore a hole.
I did not put up a picture of my steady rest. It is very simple. A piece of 1" plastic pipe about a foot long clamped to an upright on th eoutboard side of the lathe headstock.
fishbum