The rules here don't allow for thread bumping, just a heads up.
I've got mine here, and it definitely looks like the only way to get it back in there is to crack the adapter open. I also suspect the adapter is glued together in one piece (it's meant to be replaced anyway, not serviced). If you should decide to crack it open, be away you could be in for a shock! (Pun intended), also, think about how you'll get it back together, and make it look good!
I honestly think your best bet here, if it's an issue, is to just replace it.
Otherwise (and don't laugh!) my friend broke one of his too on his MacBook. So he took a popsicle stick and rubber banded it to the side that was broken whenever he needed to 'pack away' his charger. Then he could wrap the cord around the popsicle stick on one side, the and remaining tang on the other side.
Personally, I'd just wrap it around the brick itself in that case if it were me

But hey, I figured I'd share that with ya! LOL