> Drill an ugly 1/2 hole and expand it with a dremel?
Is it a flat or contoured surface?
I've got a few old radio chassis punches in varying condition that
sometimes come in handy for such things.
Failing that, I think I'd ink/paint the 3/4in diameter on the surface,
use a really sharp 5/8 or 11/16in holesaw depending on how much wobble
it had, then clean it up with a 1/2in or so grinding stone in a Dremel
or die grinder.
John.
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