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The DMT company specifically declares that their 120 grit plate is the only one they consider to be used for lapping. They acknowledge that the 220 and 325 (such as the DMT8C) grit hones can be used...

Since no one has answered your questions, I will. You could use wet/dry sandpaper in the range of 180 to 600. You could go even lower than that if you need more aggressive removal for initial...