Hi All, I have an Acoustic/Electric Guitar that i am trying to sell. ITs a Franciscan CN-8. (whatever that means) it belonged to my father who passed away..anyways its in great condition but there is one thing i noticed inside the guitar. I keep hearing something banging around. When i looked inside i saw this round thing on a cord loose inside. WHat is it? I was wondering if the guitar sounds broken? It looks like it was glued or something. Can someone tell me what it is that is in the guitar please? thanks