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A feature of using a 320 DMT are the deeper scratches in the hone surface.
These scratches do not load up with dark swarf and are a nice indicator of hone wear.
When the scratches vanish there is a...

I have felt this with the rubbing stone that expensive hones come with.
I have felt this with the Norton lapping stone... on Norton hones.
and Naniwa nagura rubbing stones on Naniwa hones.
A...