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Just use it.

Good question. I'd guess 15-20 laps. I go by feel and visual inspection with a loupe. Sometimes I'll start with slurry from lapping the 12k with a DMT325 then do about 10 laps clean the 12K and come...

I love the Naniwas super. Easy to learn. The 12k is a fantastic finisher and will serve you well. I use electrical tape tp protect the spine from wear but never fret about putting a blade on the...