Hosel reaming clamps. Miscalculated an assembly point, but they should work. Will test one, and have sent another out for testing, by a Pro.
I don't think, after careful thought/considerations, this is something I will be making for public sale, like the shaft clamps/spine finders. My thoughts are that this can be a dangerous tool/accessory, in the hands of a lot of people. I'll not accept that liability. They should never be used except with a drill press and firmly bolted(not clamped) in place. Most will not have a drill press. I shudder when I read of reaming being done with hand drills and 'bits' being used, even when I know the person is careful and experienced with equipment/tools. IMO, that is not the way it was ever intended to be done, and should never be done that way.
They were something to kill some time, so no big loss, and they would never be big sellers anyway.