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haha, thanks man. Now I don't feel bad about posting that at all :banghead:

But actually I think I read that tooth-to-the-stone trick in one of those really old barbers manuals, so hey don't blame...

Yeah sure. I do the tongue-test on flattened spots on stones when out in the field to get an idea of grit, and I've also bitten the corners of my thuringians, slowly dragging my teeth lightly into...