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If you're going for a DMT for lapping they won't warranty anything but a DMTC 325 or coarser. The X or the XX. It was found out the hard way that anything above the 325 will get worn out in a hurry...

I recall a sign in a high performance car parts store,"Speed is expensive, how fast do you want to go?" :D

If you liked the feel of the edge off of a coticule I would say a natural 2x6 or a slate...