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The grit to use when lapping the stone depends on how flat the stone is to start with. If you need to remove a lot of material, then 220 grit may be needed. If the stone is nearly flat, then you...

On a new hone that has never been lapped, I generally flatten it on SIC wet/dry paper backed by granite. Then I do the final lapping with a Atoma 1200 diamond plate. If any of the SIC gets embedded...