OK - its more of an anoying buzz but if I called the thread fingerboard buzz it might make you think this was about fingerboard profile. If I stop a low B or C on either the E or A string I get a buzzy rattle. Grabbing hold of the end of the fingerboard stops it. I can also recreate it by tapping/flicking the end of the fingerboard. I can't tell where it is coming from either - if I listen to the top end of the fingerboard it could be there or if I listen to the bottom it could be there also. I see nothing loose and no gaps. For the majoriy of the time it's drowned out and I don't notice it but when I do it drives me nuts. However, what I'm really worried about is that it may indicate structural weakness. Anyone got any ideas as to the casue, the rememdy and whether the remedy is worth it please kind people?