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There's nothing special about a granite lapping plate and you can use your countertop. The surface you use for lapping may get dull and receive scratches from loose grit. I use glass plates and after...

It sounds like it could use a lapping. Swaty's are really hard so make sure to start with coarse sanding paper and work your way up to a fine grit. I'd start with a 120 grit sanding mesh if it's...