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Is it possible to revive an old guitar?
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estebanana
Posts: 9413
Joined: Oct. 16 2009
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RE: Is it possible to revive an old ... (in reply to FelixH)
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The crack on the ribs seems stable. When you see neatly done linen tapes glued over a curved surface like a rib it’s usually a sign of a good repair done by a someone who’s ok. It also means that repair is reversible if someone comes along later and has to re work the repair if it fails. This is good and looks well done. Just watch that it doesn’t come undone and flaps around. Back to the crack parallel to the fingerboard- this is not a crack generated by fingerboard shrinkage. ( it could have been started that way a long time ago but I doubt it) these often happen as a result of being left in the heat, maybe this is or maybe it isn’t, but it’s not good. It indicates the guitar is folding up on itself and I suspect since the 12th fret action is 4mm that the neck moved forward. It could be straight and rigid, but it’s probably moved with the body join area being the fulcrum point. There’s no guarantee this crack is stable, because the crack is only an outward expression of structural slippage, the structure is moving and the part of the top attached to the fingerboard has stayed with the fingerboard and is being driven towards the bridge as the neck moves forwards and down. The other side of the top not attached to the neck is staying in place because it’s attached to the big stable arc of the ribs. This a seismic movement and the crack is the fault line. The neck is slipping towards the bridge and it probably won’t stop. The remedy isn’t easy, but the course is probably something version of removing the fingerboard and dis attaching the upper transverse brace from the top. Then seeing if the southward moving section of the top can be persuaded to move back up towards the nut. That closes the crack and shifts all the broken material in the rosette back into a perfect circle. If all that works the crack gets glued and the transverse brace gets glued back in the area where it was dis attached. After this you’d probably want to double check what ever cross grain patch or graft Reyes put under the fingerboard, and if there is something there, it would likely have to be dis attached at the same time the transverse brace gets loosened. And this is probably the medium difficult route, because if the top doesn’t want to pull back up and close the crack when you gently push the neck back, then you get into weird stuff like removing the section of top under the fingerboard from the neck block interior and slipping it up higher and re gluing it to close the crack. To me visualizing these operations ahead of time is routine. This may or may not be the remedy for this condition of structural failure, but it’s important to take to someone who can see it like a chess game ten moves ahead.
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Date Jun. 25 2021 4:15:12
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