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Norton "unflattening" stone?
I bought a Norton flattening stone online from Lee Valley, and when it got here I tested it out on a cheap stone. Something seemed strange because the middle of the stone didn't seem to be getting lapped. I held the Norton up against a few things I knew to be flat and noticed a rather pronounced concave bow in the flattening surface. Now, I'm a definite newbie and all, but shouldn't a flattening stone be... flat?!
Here's a pic of my Shapton laying on its side on the Norton's flattening surface.