ORIGINAL: Argess

Try to drill it out from the backside, the end of the screw is usually "cupped" from the thread-rolling process, and the drill bit will center better. As it's not a blind hole, you can expect that the drill bit will catch on the screw and actually screw itself out. The heat from the drilling also helps soften the loctite. (A drill-press and a vice are highly recommended.)

Mine recently broke, but it was my own fault. I had it apart and forgot to loctite it when I put it back in. Once it loosened, it fatigued and broke. There have been some repairs on this already in the forums. One is to drill and tap for a 5mm bolt, another is to use a 4mm grade 12.9 bolt. I like the one that suggests you install a bolt from the backside of the clutchbell and use a loc-nut on the pinion side. If it ever breaks, you can easily unscrew the broken part as the head is still attached in the clutch-bell.