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 Post subject: reglue loose brace
PostPosted: Sat Mar 31, 2012 10:43 am 
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Brazilian Rosewood
Brazilian Rosewood
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Joined: Wed Sep 24, 2008 8:55 pm
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Location: Taiwan
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Remember that guitar with the spruce bridge plate a while back?

There was a crack in one of the X braces, but upon further inspection not only that brace is cracked, but the entire lower section of that brace is completely loose and dangling.

How can I go about regluing loose braces? what kind of glue should I use for this?

I was actually kind of wondering if I should just go ahead and remove the back so I can take care of all the problem at once...

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 Post subject: Re: reglue loose brace
PostPosted: Sat Mar 31, 2012 11:40 am 
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Koa
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I vote for removing the back. And probably remove the brace or braces and put in ones with proper grain alignment.


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 Post subject: Re: reglue loose brace
PostPosted: Sat Mar 31, 2012 12:39 pm 
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Brazilian Rosewood
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That's one of the possible effects of invisible runout, the braces can split along the grain and pop off the soundboard.
Here's a photo of a commercial brace I bought from a reputable supplier taken of the side of the brace. As you can see from where I split the wood, the invisible grain runs out from the top to the bottom of the brace at a pretty severe angle. Any one of those grain lines is a potential weak point along which the brace can split. You can't really tell which direction the grain is running once they're sanded smooth.


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 Post subject: Re: reglue loose brace
PostPosted: Sat Mar 31, 2012 8:42 pm 
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Contributing Member
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Joined: Wed Sep 08, 2010 12:17 am
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First name: John
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On the older guitars I favor hot hide glue, but I will use Titebond to reglue braces on modern guitars, especially if I need extra working time. I would never remove the back to do this operation. I work glue under the braces with a small spatula. I use brace jacks every two inches or so, and clamp a board across the outside if needed.

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 Post subject: Re: reglue loose brace
PostPosted: Sat Mar 31, 2012 10:54 pm 
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Location: chicagoland, illinois
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i had to do it a couple months ago, and i ended up: keeping the guitar assembled, using watered down titebond, squirted in with a syringe and long rubber tube. to clamp, i (beforehand) made a few lengths of wood exactly the right lengths(if the ends are rounded off a bit, they can be a few mm too long, by tilting you can get them to fit)by cutting/sanding till they wedged in firmly enough to jam everything together.
my braces were actually cracked, exactly as in the other poster's photo, but the concept is the same


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