One issue I found was the adjuster bolt was bent in the crash.




I thought I’d at least try to straighten it, so the first process was to anneal the bent section. This makes the aluminum more ductile and easier to bend without breaking. It’s also less likely to break in the future. To anneal the aluminum you need to heat it to around 600°F and let it cool naturally. The easiest way to gauge the temp is by drawing on it with a black Magic Marker and heat it until the black burns off. Once it was cool I clamped an M4x.7mm coupling nut in the vise, then threaded the bolt in until I felt a bit of resistance.




I then took the same 8mm socket with the driver handle (I’ve had this Craftsman RHFT socket set since I bought it new in 1981) and used it to finesse the bending until it would screw into the coupling nut with minimal resistance.






Once it was done I checked it in the threads of the derailleur. It screwed in without issue.