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Metal must feel, I do not know how to explain it. Starting work on the anvil and finishing heat treatment. If there are errors then you can see them, but the error - it is a razor that must be thrown...

I say, just experience. I personally work differently.

I'm such a method of tempering chisels, only when I do turn off the light quenching. Mastro Livi have a lot of experience, so he knows better. Bruno everything is explained in detail.