i hadn't used it for a while and never was great with it. feeling a bit musical after listening to emo metalcore(atreyu and BFMV have some f**ing great solos bro), the other day i tried to jack-in my guitar, but something was wrong...something was moving. the amp works fine, but the bit you plug the jack into inside the guitar is moving around loosely under the jack cover plate. what do i do to fix this?