your only drilling the HEAD off the screw NOT DRILLING THE WHOLE SCREW OUT. just use a drill bit thats a little bigger than the threaded portion of the bolt and go easy, if will finally just pop the head off and the rest you can get with an easy out/reverse drill bit (left handed), plyers etc. you may have to heat the area a bit since they will prob. have used RED/BLUE loctite on the bolts.
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