Thank you. Stubborn screws were fused to the burner assembly. Drilled head of,f then drill bit would not drill thru screw shank, rather to side of burner. Same with sparker. All the burner tops are like this. Fortunately, the one needing repair was a front burner & I was able to lift stove top enough to get the burner out to work on igniter screw. I am going to mount a small vise in my truck, for future, that would help facilitate repair modification. Repair to longer than I expected. Another reason for using Blue Book pricing on all jobs. I will make up for time an easy lid switch job.