I've got the itch to put together a mortiser (woodwork machine), and have some ideas about pulleys that will make a useful one from (mainly) wood, not needing a strong column for alignment.
The problem is, all mortise chisels use a 0.625" round barrel, and they have to be clamped (not possible in wood, this is a metal part), so as not to shift or rotate in operation. The easy way is to make a sloppy bore in cast iron, and tighten a couple of setscrews.
I don't particularly like that, though: the barrel gets marred, and small adjustments become difficult.
So, how else can I clamp the chisel? Is it possible to just buy something like an oarlock socket, with a tightening mechanism? Maybe use a pair of V blocks with a hinge and tightening screw? Or, one hemicylinder socket and a V block opposing it?