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I see a lot of guys use 325. If it was a DMT they recommend that or the 220 grit for lapping waterstones. Be prepared to spend some time. My Swatys were tough. Under running water is best.

For starters here is a tutorial by Josh Earl. He used to post here when I first came around. I don't know which side would be the intended side. I would paste one side with one substance and save the...