Originally Posted by
Texas10
If you're left with no option but drill, I strongly suggest getting a left hand twist drill to do the job. Unlike an standard right hand drill, these apply a loosening effort to the screw as it bites into the head. Add a judicious amount of heat to soften the thread sealant and chances are it'll break free and back out before you get the head drilled off.
Can't tell you how many times a left hand drill has saved me a lot of work and expense with a stuck fastener. Easy outs are a thing of the past now.
Good luck!