Quote:
Originally posted by Skunks
After a few turns, though, I couldn't screw it in further. I've been unable to get it fully screwed back in; I think I've got the angle wrong, or something.
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Yah, it sounds like you're cross threaded. You'll want to back it out and clean the threads both on the derailler bolt and in the frame. If possible, I always start turning a bolt without a wrench but I don't think you can do that with this bolt because you can't reach the head. Be very careful never to force it, you could strip the threads. Try to wiggle the head of the bolt a little to try to catch the thread properly. If you can't get it you may be going to the shop to get someone to run a tap through the frame threads to clean them up. Since you're headed for the shop anyway...
If it is shifting better with the derailler one cm out, the hanger may be bent toward the frame. From the photo, though, it does not appear that the hanger is bent significantly. Could your derailler cage be bent? The pulleys should be on a straight line perpendicular to the floor when the bike is upright. You should also look for cracks in the derailler body and make sure the bolt isn't bent (unlikely).
Before we got this far I should have asked if you if it was shifting smoothly and if you had adjusted the cable tension using the knob on the back of the derailler or on your right shifter.
Was the squeaking constant or just in particular gears? If its only in the low (large) gear your stop could be maladjusted.