It really is very forgiving as long as you get it pretty close. If you have corners that are a little too big the die will round them off. The big thing is getting the die running square to the direction you want the knob to screw on. Just take it slow and if it binds up on you, back up the die until it frees up and try again.....hopefully you will gain a little each time. A little thread cutting oil is helpful too.
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