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My earphones kept breaking (I use them while working out) so I reinforced the sensitive area with a heat-shrink wire wrap, like these:

http://www.amazon.com/dp/B008WWC6FU

It works wonders. I'm not sure this would work for Mac chargers because you couldn't get the sleeve over the ends, but it also works iPhone charger cables.

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I used Sugru (sugru.com) to fix my mac charger and other things, my earphone cable is next.

I've used both shrink tubing and Sugru on iPhone cables. On the MacBook charger, just Sugru. Both will fail eventually. I find that typical shrink wrap is too stiff and creates stress riser. After a couple of years, my cables are more patch than original.

I'm planning on doing this with shrink wrap. My plan will be to not completely shrink the cable-side of the shrink wrap to leave some play so I don't create a stiff point.

I have tried using Sugru to fix my Mac charger. It only worked as a temporary fix for me. I think the problem is that Sugru is not elastic enough and tends to crack when it bends.

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