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The Cement block did a good job of flatting the flattening stone. I then used 80 sand paper and 150 grit sand paper laid on a granite floor tile to finish the norton flattening stone.

Since I had...

Thanks for your suggestions gents.
I uses a cement cinder block to flatten the norton flattening stone. Took about 30 minutes to get the stone flat. Next up will be some 80 grit and 120 grit...

What is the quickest way to flatten a Norton flattening stone?

I recently picked up a used norton flattening stone that is severely cupped in the middle.

I am thinking coarse sandpaper or...