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My rear derailleur barrel adjuster has unscrewed completely and now I can't get it back in.

Is it likely that I've damaged something here, or is there some special technique to screw in barrel adjusters that I don't know about!?

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It sounds like the threads might be fouled. Probably best take to a bike shop. – Daniel R Hicks Aug 7 '14 at 11:51
    
Have you completely detached the cable? Or are you trying to get it back in with the cable still going through the barrel adjuster. If you haven't removed the cable or at least loosened the clamp nut (or whatever it's called) to let the cable the cable go slack then you might not be aligning things properly. – Kibbee Aug 7 '14 at 12:28
    
I removed the cable completely and tried to screw the adjuster into the derailleur directly with no success. – Robert Dougan Aug 7 '14 at 15:15
    
Can you post some close-up photos of the adjuster and the derailleur? – stranger Aug 7 '14 at 15:47
    
There are three parts: a threaded tube, a spring and the plastic barrel. The tube fits into the barrel and the spring goes over the threads. You screw the adjuster in while pushing the tube with a fingertip. You might screw the tube in first to check if the threading is OK! – Carel Aug 7 '14 at 17:03

There are three parts: a threaded tube, a spring and the plastic barrel. The tube fits into the barrel and the spring goes over the threads, then the cable goes up the middle of all of them. You screw the adjuster in while pushing the tube with a fingertip. You might screw the tube in first to check if the threading in the derailleur is ok, but usually that's not necessary.

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