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FDP Forum / Guitar Mods, Repairs, and Projects / Need help with gluing neck

Contributing Member

South Jersey/USA

She turned me into a newt!....
May 25th, 2018 07:00 PM   Edit   Profile  

I have a cheap 3/4 size nylon string acoustic that we got when the kids were real small and they wanted to learn (beat on) a guitar. So it wasn't one of mine. :^D

Anyway, my youngest daughter wants to learn again so I pulled this old one out. It is a good size for her hands and wont kill her fingers being a nylon string.

It seems the neck is pulling away from the body about a 1/16"-1/8" and I can move it easily back into position.

I don't think there is enough room there to try to get some tightbond in there. Would super glue be a good option?

Contributing Member

A dog

in a cake shop
May 25th, 2018 08:44 PM   Edit   Profile  

No, not really because CA does not gap-fill very well.

For a neck joint to hold, the wood mating surfaces need to be lined up and the fit needs to be snug with little to no air gaps.

Best approach is to heat the fingerboard tongue with an iron and lift out the neck. Clean the mating surfaces of old glue; scrape it off--don't rasp/file/sand, because you don't want to remove any wood.

Re-glue it and clamp it up. This is the proper way to repair a loose neck.

If you don't want to spend a lot of time and $$ on the repair, apply Titebond all the way around the loose joint and flex the neck to work the liquid glue into the joint. Flexing it acts like a pump to draw the glue in. Keep a bead of glue on the joint as you flex because any air gap in the glue line will draw air in, not glue. Work the glue in like this for five minutes or so, then clamp it up and use a damp cloth to wipe up the squeeze-out. You do waste a lot of glue this way, but for a quick repair it does the trick on a cheap beater guitar.

Contributing Member

A dog

in a cake shop
May 25th, 2018 08:53 PM   Edit   Profile  

Some cheaper guitars (and a few expensive ones too) use hanger bolts in the neck joint.

Look inside the sound hole at the neck block and see if there is a nut and washer on a threaded bolt. Sometimes there are two.

If so, *you are in LUCK!* Put a socket or nut driver on 'em and snug them down. Just snug. If you hear wood creaking as you work, it's too tight.

Looks like this: truss rod adjust above, two neck bolts below.


michigan usa

May 25th, 2018 09:36 PM   Edit   Profile  

Doesn't sound like something worth putting too much time and energy into. I'd go with Peeg's second option. You can also pick up a cheap, disposable syringe to inject the glue into the joint. They're available at hardware stores in my area. The flexing technique only works so well as, while flexing in one direction may pull the glue in, flexing in the other direction will push it out.

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Contributing Member

A dog

in a cake shop
May 25th, 2018 09:49 PM   Edit   Profile  

That's why you flex it a bunch of times. It "walks" the glue in.

Same principle as adding a drop of oil to one end of a moving shaft and rotating it 50 times; the oil creeps in and coats the entire shaft.

Another option in addition to a syringe is to use pressurized air (a compressor or canned air duster) to blow the glue line into the crack. This is messy...do it outside...but it works.


New Jersey

I'm back with the otters again
May 29th, 2018 11:22 AM   Edit   Profile  

You can drill a 1/8" hole into the fretboard 3/8ths to 1/2 of an inch from where the neck meets the guitar body -- That should get you right over the bottom of the neck joint. Go dead center of the fretboard between a pair of frets. You can inject some Titebond glue and work the neck back and forth. Before you do, devise a way to clamp the neck in the correct position that it can stay in for about 4 days.

The problem here is that glue doesn't bond to old glue very well. The right way to fix it is to remove the neck and clean up the joint first and then use wooden micro shims to get the joint to mate properly with the neck at the correct angle.

But yea, its a cheap guitar. Maybe think twice about putting it in a young person's hand as a learner if it turns out less than decent to play. Learning when you're a little person is difficult enough. I highly encourage parents to start kids on Ukulele first. They're inexpensive and the learning curve can be really fast cuz they're so easy to play and everything they learn on uke applies to guitar.

FDP Forum / Guitar Mods, Repairs, and Projects / Need help with gluing neck

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