Precision gage balls. By ROBRENZ. 47:25 video:
The diamond grit core drill grinds, the wood not only supports the sphere, imparts lapping action as well. Even green buffing compound charged wood dowel spun in a die grinder will polish steel grooves, like stacking lugs of a injection mold core for a cup, or reliefs on a revolver cylinder.
...we'll learn more by wandering than searching...
Scotsman Hosie (Sep 13, 2021)
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