How would you solve this? Was taking the muffler off of my BP blower - 2 screws into cylinder and one bracing the muffler to the bottom of the crankcase. The one screw at the bottom was a phillips/flat screw. Had good grip with phillips but it WOULD NOT budge. I could even feel the screwdriver shaft twisting from the pressure. Rounded it out. Went to flat because the screw was a phillips with the slot in it too and the flat rounded off too. This is a tight place to get to - requires about 5 inches of the screwdriver shaft. In other words way too tight to get my drill with a screw extractor to and bolt head is now rounded out. What are my options? Thanks.