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I have exactly noticed the grainy feel you mention especially on the 4k side and yes I think I might have taken off a good 1/8th inch until it felt truly flat and smooth. Wondering how the Shapton...

I recently bought a new Norton 4k/8k and a naniwa 12k and noticed that they did not wear off evenly using the flattening stone. Is it expected to have to flatten norton stones after soaking them in...