The reason I give 4 stars is because the top switch didn't work properly and gave an I-Key error. I find that I didn't have to change the upper derailleur to fix the stuck shift, I took the whole shaft apart again and replaced my old original upper derailleur back. Now the I-Key error is gone. If the shift is stuck, just change the bottom switch and it works fine without showing the I-Key error. I hope this helps anyone who is having trouble with the I-Key error message.
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