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I've never had a lumpy stone. My Norton 4K had a lot of porosity, but my hones (even when new) only showed a very slight curvature across the surface.

In the interest of keeping this thread on...

I'm missing something here....

If there aren't any irregularities in the blade how does the flatness of the stone affect the way the blade sits on the stone (relative to a one side vs the other...