How to Put the replacement cable in a rear derailleur
The cable that connects your rear derailleur to the shifters on your bike may seem too long, delicate, and complex to fix yourself. You may be right, but if you have some bike maintenance experience and want to try then this video is for you. It walks you through the whole process of replacing the cable in your rear derailleur. It is a long process, and elaborate, but will dramatically improve your shifting performance if your cable is old and worn.