It’s flat! Or is it?

When I first started using waterstones I purchased a Norton flattening stone along with them.  I’ve been using it for years and I naively just assumed that the flattening stone has remained flat.  I tested its flatness tonight by rubbing it on  a piece of 220 grit sandpaper that was adhered to a flat granite surface plate.  Well, you can see by the picture below that it was not flat.  There are high spots on two outside corners and a hollow in the center.  After realizing this, I’ve decided to abandon flattening my waterstones using this method.  Instead, I plan on flattening my waterstones directly on a piece of 220 grit sandpaper (with the granite surface plate).  The alternative would be to flatten the flattening stone on the sandpaper, but I thought that it would make more sense to cut out the middleman.

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