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That's what we use our almost worn out DMTs to do - double check the flatness, clean the stone, and make a bit of slurry.

rs,
Tack

Bill- I have switched to the mesh "sandpaper" used to sand...

+1. The DMT people specifically say NOT to use the 325 or 220 to lap stones. They make a 140 grit plate specially designed for lapping. That said, many here use the 325 to lap, more use the 220...