I recently ran into a little problem with one of my UMD discs that was loose at the top of the disc. This was causing a bad rattle that sounded like the disc was being scratched badly. I fixed it by super gluing the case shut in the loose spots. If you run into a problem like this be sure not to get super glue on the bottom of the case or you may need to replace the case. Especially make sure you don’t get it on the actual disc or you may have to replace the entire game!

Glue is best