I have a very cool Kickstarter project for you called Python Cords, by Elliot Snyder. This is very easy to install protector for your Apple charging cords that, "displaces the stress point by spreading it over a greater distance." Its silicone tubing, "acts as a shock absorber preventing the common stress fracture from occurring." And it does all this without permanently altering your charger. If you've ever had to replace an Apple charger from cord-wear, you'll instantly recognize the value Python Cord offers. If you watch the video, you'll see at the end how easy it is to use, and if you look at the $8 price of the main funding option, you'll say giddy up!
Check It Out: Python Cord on Kickstarter Protects Your Charger Cords