Did exactly what I needed. My derailleur got caught in my spokes and the cage was twisted. My LBS of course suggested that I buy a new one (and cable, housing, + labor to install and set up), and couldn't find a replacement cage. So I found/bought this one. After installing it the derailleur was still at an odd angle and didn't shift right until I noticed that the derailleur hanger was bent. I was able to straighten it, and then everything shifted perfectly!