Update:
While waiting for the hd plate with 3/8" screw, I made a version with the standard 1/4" screw.
once the 3/8 plate arrives I'll make an oak block insert for the nut and bolt to pass through to make the whole setup more solid. But even with the free floating bolt setup, it is solid enough to do the job.
One nice touch is that the base plate is quick release so that it can be set aside easily. If the ball mount were setup somewhere more out of the way, it would make for a very quick setup and takedown.
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