After spending much of the morning trying to get my bar-end weights off and nearly destroying the soft metal screws, I thought it would be worth posting this up for anyone who runs into trouble: http://www.crankshaftcoalition.com/wiki/Removing_rusted_and_broken_fasteners Lots of techniques in there. What worked for my bar-ends? A combination of things: - WD-40 around the screw - heated up a crap screwdriver on the stovetop, then stuck it in the slot of the screw and left it there for an hour or two - Spanner on the end of a stubby screwdriver, twisting while hitting the metal end of the screwdriver with a hammer - Approximately one million whacks on an impact driver, one of which finally freed the screw. Turned out it was threadlocked with that permanent red stuff. It smelled burny when it came out, so I wouldn't be surprised if the heat helped a lot.