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I only use the TNT at bevel set and even then it is with very light pressure.

I'm the wrong guy to ask about the TPT. I don't get a good read from it despite doing a one on one specifically on the TPT with Lynn at a meet. If I wanted to improve my TPT, I would work with a...

The TNT is a fine test to use AT BEVEL SET. Yes it does damage the edge slightly, but the damage is easily repaired with a few more strokes on the bevel setter before moving to the next stone.
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