[microman]

Yes, this seems to happen to all of my chargers. So far I've had to fix 4 (all on the magsafe end).

I used self amalgamating tape[0] on two of them and it's worked really well (albeit a slightly ugly fix). On the other two I used Sugru[1] which is prettier but not as flexible.

[0]http://en.wikipedia.org/wiki/Self-amalgamating_tape [1]https://sugru.com/