Not sure if you'll have enough room to get inside and put a new one in. If you do, to remove the old one, heat up a soildering iron, place it inside the blind nut to melt the glue, place the screw in the nut as far as you can get it it, and tap the blind nut out with a hammer. Just be careful not to leave the iron in there too long or it may start a fire. It sounds like your not going to be able to get a new nut in there very eaisly though. Good luck with it anyway.