| For foil, it's 3.5mm x 0.6, for epee 4.0 x 0.7. You want to put some piece of metal in the groove to keep the die from hanging up on it-- a solid piece of wire, or a bit of solder. Even then, you need to proceed with care or else you can ruin both the threading and the die.
It's best to do it when you only need to 'freshen up' already existing threading that's been mashed or worn. If you're thinking of cutting new threading right above where the tip snapped off, your chance of success is smaller, since the blade often too thick and the groove too wide-- remember that any reshaping of the blade beyond the guard by grinding or filing is expressly forbidden in the rules. Basically, if the blade broke, it broke-- you're better off getting a new one.
-Dave Neevel
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