Hi Richard, As a quick & dirty interim solution, you might try using a
brass or stainless steel plumbing compression fitting as a collet chuck.
For a 3/4x16 spindle use a 1/2 in pipe to 3/4 in. tube straight fitting
if available at a plumber's supply. The compressed oval ring prevents
axial motion better than circular motion of smooth tubing, but should be
ok for circular motion of wood. I've used smaller ones to hold bottle
stopper dowels, finials etc., but never over 1/2 in.


Turn to Safety, Arch
Fortiter



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