Removed two burner heads. Needed propane torch to heat two Torx head screws on each.. Soaked ignitor retainer Torx head screws in Nut Blaster. Got one out and broke the other. Scraped carbon/rust out of area that retainer sits in so ignitor was proper height and square/ plumb. That burner worked fine with old part. Drilled other Torx head screw out and all the way through burner head. Ground down back side of burner head to accommodate screw/nut (very soft metal). Attached new ignitor and installed small machine screw/nut through hole. Reassembled, tested, works great. Saved $100 burner head and $$$ service call.