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On used plates you need to lap first to get the step wear down flat, on new plates they do a good job from the factory making them flat and true( never checked but will from now on). Re-nitrate to a low heat to have it harden down about 3-4 thou deep after lapping. That low heat 99% will not warp the plate and no need for a touch up on re lapping after nitrating. All the plate are dial cheeked for warpage and if necessary the will be re lapped very lightly.5 thou at most... But never had a warped plate yet coming out of the nitrating process...
But at the same time i will start checking the new plate from Mazda for warpage.. you never know...
At the same time everybody has there own take on lapping or lapping with nitrating. But i can guaranty you that lapping a used plate 2-3 thou deep and checking the hardness with a dial indicator. it a much softer material with out the nitrating. Thus making sense that wear will occur more rapidly in a plate with out nitrating than with...
Hope that helps...
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