Next time you do this, heat the screw with a small soldering iron. If you notice resistance, "bounce" the wrench, rather than trying to break it loose all at once. It's a "feel" that comes from the "misery" of having been there in the past The quality and hardness of your screw will determine how easy it will be to punch and drill it. Don't even start without a good quality bit. When I worked Industrial Mantinance, I discovered "left twist" drill bits. They can be gotten mail order from Grainger or McMaster-Carr. Usually all that is needed is to get the "left twist" bit to bite and the remaining screw will twist right out. Saved my "fat" many times:) When you reinstall, don't use "Red" Loctite! Good Luck:).....Jim