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I am by no means an expert on the subject. On the contrary. But why not buy a rockwell tester instead of testing files that you temper and let them test for quite a bit of money. You could maybe spend a little bit more and you will know a lot more. I am not trying to end the discussion btw. Just curious why not buying a tester. I think they start from $400,-? You could test files for other ppl when you have it in your possesion.
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