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Another Day Another Question


Stephen Proctor

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I get to do a fair number of head repairs, this was a Guild 12 string. Its a "green stick" fracture like your (ie not completely broken off). That is both good and bad, it is much harder to get the break cleaned out and to get glue all the way inside, but it is self aligning and doesn't want to move while you put clamps on it. I used AR glue (Titebond) - hide might have been better but I wanted more working time. Wedged the crack open and worked glue inside

 

IMG_3436_zpsrt3zawhv.jpg

 

Clamped it up. The white things are UHMW - a plastic that glue won't stick to.

 

IMG_3438_zps2j9omxvu.jpg

 

Because it was a 12 string with half again as much tension, I decided to add a "back strap" - a piece of wood laminated to the back of the head. It will be in tension at the worst part of the break and make it much more stable

 

IMG_3447_zpsxhbwrtdz.jpg

 

I actually did one more thing that was total overkill - I grafted a little piece of carbon fiber over the crack itself. Totally not necessary but what the heck.

 

IMG_3455_zpsbou9tmzk.jpg

 

Here is the back strap in place and all feathered in, tuner holes redrilled

 

IMG_3459_zpsdn1kxdep.jpg

 

One of the hardest parts of any repair is making the finish look as good as possible. You can never totally hide it, but this is what I came up with

 

IMG_3466_zpsehjgt7ex.jpg

 

The good news is that the owner gigs with that guitar regularly and it seems to be holding up fine. You can certainly eliminate the carbon fiber and maybe the back strap - if I was doing it I would put one on.

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Thanks Mr Keller, those pictures are just what I needed to see. The end product looks fabulous If you lived a little closer...

AR is aliphatic resin (yellow) I take it.

What did you use for the back strap, looks like a piece of mahogany. And did you let it in to the neck or just sanded the finish off so the glue would stick.

I have fixed a couple of 6 string necks but used epoxy and could never get a decent cosmetic finish with it.

 

 

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The back strap was some mahogany scrap - left over from a side or something. It was probably 60 or 70 thousands thick. I planed that much off the back of the neck after doing the glue up - I have a cool thing called a Safe-T-Plane (sometimes I wonder how safe it really is) that I can use in a drill press

 

IMG_3448_zpsji9z5qyr.jpg

 

What you don't see in that picture is trying to balance that big old Guild 12 string body while I finessed the head under the planer - its really a two person job. AR is aliphatic resin glue, good old Titebond.

 

The other part of this story is that when the guitar came to me it had been previously repaired with some epoxy that never really cured - wrong mix or bad product or something. Anyway, my challenge was to try to get the old stuff out before putting the AR in. That was really why I did all the extra reinforcing - I was afraid that the old glue would weaken the new stuff so I just braced the hell out it.

 

Good luck with yours - if we were close it would be a pleasant afternoon to put yours back together.

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Isn't old age a wonderful thing. As I was oiling up my clamps prior to pressing it back together, And noticing that a couple of frets would be better if replaced, so I would need to find some fret wire. How would I thin the head stock for a back strap and where am I going to find some mahogany, etc etc In the midst of that reverie, I finally remembered that the husband of my partner's best friend specialised in repairing violins and cellos.

So thanks to all who have chimed in, but the Seagull 12+ is now in his capable hands

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I get to do a fair number of head repairs, this was a Guild 12 string. Its a "green stick" fracture like your (ie not completely broken off). That is both good and bad, it is much harder to get the break cleaned out and to get glue all the way inside, but it is self aligning and doesn't want to move while you put clamps on it. I used AR glue (Titebond) - hide might have been better but I wanted more working time. Wedged the crack open and worked glue inside

 

IMG_3436_zpsrt3zawhv.jpg

 

Clamped it up. The white things are UHMW - a plastic that glue won't stick to.

 

IMG_3438_zps2j9omxvu.jpg

 

Because it was a 12 string with half again as much tension, I decided to add a "back strap" - a piece of wood laminated to the back of the head. It will be in tension at the worst part of the break and make it much more stable

 

IMG_3447_zpsxhbwrtdz.jpg

 

I actually did one more thing that was total overkill - I grafted a little piece of carbon fiber over the crack itself. Totally not necessary but what the heck.

 

IMG_3455_zpsbou9tmzk.jpg

 

Here is the back strap in place and all feathered in, tuner holes redrilled

 

IMG_3459_zpsdn1kxdep.jpg

 

One of the hardest parts of any repair is making the finish look as good as possible. You can never totally hide it, but this is what I came up with

 

IMG_3466_zpsehjgt7ex.jpg

 

The good news is that the owner gigs with that guitar regularly and it seems to be holding up fine. You can certainly eliminate the carbon fiber and maybe the back strap - if I was doing it I would put one on.

 

 

Leave it to Freeman to show us how it's done!!

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