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Nope, A 220 won't lapp the C12k, it's a hard natural stone, and Don't ever try lapping anything with A D8F, you'l ruin it...

They're good stones. I'd keep the lapping stone, but it's up to you, unless you bring it back and get a DMT XX. That'd come in handy for lapping. The Chinese 12k is a hard stone, The Nortons are more...