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I have been using the Norton 1000 to refresh lap my Norton 4/8 for a couple of years. There is no cross contamination. Just rinse the 4/8 under running water and rub with a brush or your hand to...

Only for a lite "refresh" lapping.

I have the same hones and use the 1000 to perform a light/refresh lapping before each honing session. The purpose is to remove any built up swarf/junk on the hone and present a fresh cutting surface....