Alcohol is probably your best bet. As the back isn't so fragile and worrisome as the front, you should be able to get away with using alcohol and a cuetip to gingerly apply it around the backplate, then attempt to pull it away. Don't pull too hard as you may accidentally pull the entire socket through, if the application of adhesive has too much hold. Be extremely careful, and if the method suggested doesn't work, try to follow up with different methods suggested by more experienced people.