Temper the metal in the area you wish to drill (Temper means to heat until glowing red, then let it air cool naturally). This will remove the hardening.
Drill and tap it.
Then re-harden the metal by heating until it glows, then plunging it into cold water or oil. I recommend using Casenit (sp?) to increase the temperature.
BTW: I HIGHLY recommend doing some research on tempering and hardening BEFORE you hit the tumbler with the torch....
But basically, its a simply process.
-Mike
Mike 'Bootsie' Bodner
Palmetto Sharpshooter's, Commander
9996V
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