Anyone have any advice for moving a stripped adjustment screw on the front deraileur? I can’t get it to move with the screwdriver and it is down low enough that the one time I was able to get the vice grips to lock on it the seat tube was in the way of actually turning it. I’m hoping not to have to drill it out. Thanks.
If I understand correctly, the screw is frozen, probably because it’s steel in an aluminum thread, and you’ve chewed up the Phillips head so badly that the screwdriver won’t engage it any more. Is that right?
I would try penetrating oil, then put the whole thing in the freezer for four hours, put in in a vice and grab the head of the screw with your vicegrips while heating the derailleur with a hair dryer on high.
If that doesn’t work, I’d try using an EZ-OUT (or other “screw extractor”) — if you can find one that small and have a drill press and clamps sufficient to hold everything in place and don’t break it off. It’s fiddly work. Then do the cold/hot thing again.
If you drill it out, you’re definitely going to have to tap in new, larger threads. If it’s not a super high-end racing derailleur, I’d guess that wouldn’t be a problem.
welding a nut on the end of it is a standard tactic on bigger bolts, but I’ve never seen an arc welder that small. I would be impressed if JB-Weld was strong enough. Try it and let us know.