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It shouldn't matter at all.
The norton is meant to only flatten nortons because it is so soft.
The only way to damage a DMT imo is if you have a really dished out stone that scrapes into the sides...

@CrazyCliff:

Most people here have the DMTD8C and are very happy with it. I am one of those.
I also have the norton flattening stone, but if you use it with smaller stones, it'll wear down in the...