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When I lap these things to avoid the slurry build up Shaun mentioned, I do it in the kitchen sink, under running water. Helps with stiction as well. The stone is probably a good finisher. To me...

I would draw a pencil grid on it and lap whichever side you're going to use. It will probably be a slightly lighter color on that side once lapped. I wouldn't glue the label back on if it is off. If...

Quite possible. Take photos of both sides and the ends if there are saw marks on them. If they are smooth it won't really reveal anything.