A ball bearing revolving center with a single testicle
If you had a Oneway center, you could just remove the tip and insert
whatever wooden center you wanted. Or drill and tap a larger turned
rod and thread it onto the center.
I have a small wooden post I use when turning ball feet; it fits into
the center when the tip is removed, and provides a 1/4 diameter flat
to press against the "bottom" of the blank.
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