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If you use a diamond plate to refresh an Ark use under running water or under water and with light pressure or you will rip out the diamonds. I don’t use my good plates, but have eBay’s and $30 CNTG...

Nice old stone. If you look in many old fora, mostly woodworking there does seem to be a consensus that old Lilly White were much finer than later ones, some suggesting from a different source or...