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[QUOTE=SharpMan;752456]Yes, three stones of the same grit and type. You can use these to
precisely flatten each stone.

Rub:
1 A on B, A on C, B on C
2 B on A, B on C, A on C
3 C on B, C on A,...

Sorry, do I understand it right? Do you suggest that you need three same stones of the same type and grit to flatten them on each other? Interesting. The only stones I have three times in my...