Lockable bench dog for 20mm holes
thingiverse
As I am a woodworker too I had a need for a lockable bench-dog. In the past I made them from 20mm wooden rods but that was a lengthy job, mainly cleaning the lathe again, and they have the problem to be pretty loose with low humidity and stick when it's humid. Quick design in Tinkercad, 59mins of print time, an M6 nut and Epoxy glue, done. Most likely this will also work with 1/4" bolts and nuts. The 45° planes should be sanded lightly to make the parts glide smoother.
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