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You may as well lap the dished side. You don't have much to lose and potentially a finisher to gain.

Looks like one of those hybrid coticules. They are meant to be very fine. There is a thread with an example.

That's the first sign of HAD. True rockhound!

If I were you I'd go old school and counter sink it into a piece of hardwood. I have seen coticules housed this way before, and many other finishers, particularly Charnleys and Jnats. You could...