
Originally Posted by
CJS
I can answer that: not easy, not fun. As a lad, I once took a 1.5" spade bit & altered it with a bench-top grinder to round the edges. I drilled an initial pilot hole with a 7/8" or so spade bit (about a half-inch down) then went at it w/ a powerful drill. You will need a very powerful electric drill with the bat in a vise & a lot of pressure. If you don't have the vise, you'll need a "crotch of steel" to hold it on the ground. But don't plan on future reproduction, just incase something goes awry.
Let's just say this isnt a smooth process- it's rather violent at best- but it will produce a result.
On the other hand, since rule requiring a rounded cup probably dont apply to him, you could just use a regular spade or forstner bit for a flat-bottom indentation- same result.
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