I've had to deal with a bunch of stripped/stuck screws/bolts on the bike recently. The PO seemed to be fond of destroying phillips head screws, and cross threading. The most recent ones I discovered over the past couple of days; the bottom bolt holding the backrest, one of the screws on the master cylinder, and one of the screws on the helmet locks. The master cylinder screw I managed to get out with an impact driver, PB Blaster, and heat (a lot of PB Blaster!) The other two were way too far gone. I have been trying to drill out the center and then use a screw extractor (both coarse and fine grained extractors). I'm not having much joy! The extractors just don't seem to want to grab. I figure I must be doing something wrong. Any tips on the proper way to do this would be immensely appreciated as usual!! I am very frustrated at this point. Thanks!