how can you make a knife without this ?

In order to get the most out of just about anything,... you have to be aware of what it’s shortcomings are.
 
I know what my short comings are, I don't know enough about heat treating. What I do know is that what is important is to find a way that works for you and give constant results. If the results are all over the place then something isn't right.
 
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