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You can also order them direct from DMT and get them at lee valley and probably other places too. maybe even where you live, but I am not sure about that last one

they work very well for lapping. Some guys prefer the 1200. There is actually a dis-flat lapping plate that is awesome for really rough hone but in my opinion it is too coarse for something that is...

If you want to use a hone for lapping it needs to be fairly coarse and truly flat. I have used a 220 to lap my nortons and a few others. It works but it takes a lot of water and you need to keep it...