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#1
04-05-2016, 02:19 PM
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Restore a Yamaha classic CG170SA
Hello, my classical Yamaha guitar has a problem at the bridge.
There´s a bulge below and "dent" above it. I try to straighten it with humidity. But does anybody know what a suitable level of humidity for this process might be? How high humidity is acceptable? I keep a sponge with distilled water inside the guitar and a cover of the sound hole. I´ve inspected the bracing inside and as far as I can see there´s nothing wrong with it. Best regards https://www.dropbox.com/s/wbfsq7msx3...ridge.jpg?dl=0 https://www.dropbox.com/s/1jer3ivnbr...0side.jpg?dl=0 https://www.dropbox.com/s/yd8yv37rv2...reble.jpg?dl=0 Last edited by Henning; 04-07-2016 at 10:31 AM. 
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#2
04-07-2016, 10:26 AM
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Some difficulties
Could anybody please help me out on this?
It doesn´t seem to be so easy to solve this matter. Where I live the humidity has been between 30 - 40 % during winter.
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#3
04-07-2016, 07:40 PM
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Offhand, it looks fine to me. I suspect you don't need to do anything. Guitars sometimes do show that kind of top deformation - some more than others - without serious long term issues.
__________________
Cheers, Frank Ford
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#4
04-08-2016, 01:24 AM
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Quote:
Regards Last edited by Henning; 04-08-2016 at 03:19 AM.
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#5
04-08-2016, 06:21 AM
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If the action and intonation are ok then you are fine, nothing looks really wrong with that guitar based on those images. If the bridge has rotated so far forward that your intonation is off then you have problems. But guitars folding up and trying to destroy themselves over time is simply what they do. Builders who like to build very light and on the responsive end of design even like to see a little bit of bridge rotation.
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#6
04-11-2016, 02:15 AM
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Thanks for your responses. Seems as though I´ve been worrying unnecessarily. I´ve somewhat straightened the adjustable bone piece in the bridge and changed it from the original plastics to a piece of elk bone I found in the forrest.
That made a big difference in improvement of the sound.  I think the guitar is sturdily built and there are no problems with the action nor the intonation, thanks. Last edited by Henning; 04-11-2016 at 03:35 AM.
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#8
04-12-2016, 03:16 AM
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Quote:
 Actually, the photos of the bridge in the posting #1 shows the elk bone installed. But I can tell it is somewhat harder to form then what you can buy in the stores that they call boneplastic. The smell however, while shaping it is at least of the same strength.  Here a some photos of the pieces of bone I used. 1 https://www.dropbox.com/s/h5dgyjem6m...I1028.JPG?dl=0 2 https://www.dropbox.com/s/ryhfo9zuw0...I1029.JPG?dl=0 Regards Last edited by Henning; 04-12-2016 at 08:44 AM.
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