4 of the 6 phillips head pan screws (Honda part # 91508-MM5-000) mounted at the base of the air funnels in my 2000 929's airbox are stripped. I'm sure I made the heads worse when trying to remove them (they were extremely tight due to previous work done by a shop years ago). Any advice on how to get them out?? I've heard about drilling out, but have never done that before. Thanks in advance.