Thanks. That's very Interesting. How did you tune in the AHT? What do you look for?
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After honing a unknown number of razors (I stopped counting around 500 a couple years ago) I've learned to know how my armhair will cut when the desired level of sharpness is reached.
For my hairs it means the razor should easily pop the hairs at least 1 cm above skin level, when it does, I know it's sharp enough, and as long as I use a progression with the stones I know well, I can also tell with pretty good accuracy that the smoothness required is at place.
I always hold the root end as it's a harder test to pass and start pretty far out and probe the edge at several points to identify any weak areas. Once I have an edge that drops hairs at least one inch out all along the edge I go to the shave test - this has worked very well for me. I also pay close attention to how the hair actually cuts - does it catch and cut, fall away, etc. My hair is a much harder test to pass than my wife's so I generally start with hers and then test one of mine or two.
John