Ok, my first problem with my new Fretless is that one of the volume knobs has come loose. So I opened up the back panel and saw the volume and tone units are all held in by glue except the one that has come unstuck. I'm not very technically minded but I just need something to keep the unit firmly in place. My dad suggested using selotape to keep it firm temporarily but I'm not sure so I thought I'd seek some better advice. Eventually, I presume I'd need to glue it back in place firmly with super glue or something? Thanks.