garydyr:
One more idea: Check out a Longworth chuck.
Yes, in addition to the 3-jaw scroll chucks I pointed to in Reply #13, Thingiverse also has models of Longworth chucks: Search Thingiverse - Thingiverse
There are many, many types of collets and holders and many different sizes that will fit whatever you want to grip. There are even collets made of molded rubber with steel blades that will grip any intermediate knob sizes.
Paul
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