They don't make some kind of a vise for you to use?
Get two pieces of wood and drill a hole in them both and use a nice long bolt and a tee nut and nail one side to the plywood or something.
I suppose I could clamp it down, but with all angles I have to attack from… I’d rather just try to be more careful. Went too deep, back of the chuck rubbed the stone and my hand was in the way. Stupid mistake, I’ll live.
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