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Sure, everyone loves and uses radius cauls all the time.... indispensable, really.  But every so often, there's a need that arises for one that's convex instead of concave. A "reverse caul", if you will.   Maybe for the underside of a curved nut, or....?   Anyway, I had use for a 12" "reverse caul" so sanded one up by hand (on the left, obviously). It was a lot of work and isn't 100% accurate, bu…