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I've used the 220 lapping plate on all my Naniwa SS. All the way up to the 12K. It worked great! No worries, that 220 will do just fine IMO.
Another very good option would be the DMT 325 diamond...

Without knowing what stone and what lapping plate, I would venture to say yes to that question.

I use a DMT 325 to lap everthing from a 1K to 12 in synthetics(SS and Chosera)
With naturals, I...