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Hi Rob, Sorry to hear about the problem. It sounds like the string guide / top-nut has just taken a knock dislodged. They were glued on with epoxy so you just need to clean up the surface of the brass and the end of the fingerboard before gluing it back on. I guess the extra string rattle is just because the top-nut is vibrating when you play as the zero fret would not have moved. I hope this helps. Regards, Rob Green.