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Thread: Crack repair

  1. #1
    Join Date
    Jan 2009
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    Default Crack repair

    I needed to fit a some patches inside a badly cracked soprano. The first two, near the sound hole, were easy enough, but my fingers won't reach down to near the bridge, so I pulled a glued patch into place using a knotted string, and an old strap button. I'll fill the hole with a tiny rod of mahogany.

    Timms 'Island' style soprano.jpg

    It worked rather well.

    John Colter
    Last edited by ukantor; 04-01-2019 at 07:50 AM.

  2. #2
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    Petaluma, CA
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    Default

    This technique seems to work with cleats, bridges and I can picture a loop securing a brace. This makes the rescuke table much easier. Many thanks Dave AKA spongelke.

  3. #3
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    I got the idea from a post by mikeyb2 in the thread about an alternative bridge clamping device. That's what makes a forum like this so valuable and interesting.

    John Colter.

  4. #4
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    Default

    I've put cleats in using magnets , works great , no holes.
    " Anything larger than a soprano is cheating "
    " I'm no luthier but ,........"

  5. #5
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    Default

    I did just that with the first two cleats, Pete, but this one was too far from the sound hole, and I wanted the cleat to be partially under the bridge, so no room to position a magnet on the outer surface. Neodymium magnets are scarily powerful and difficult to manage in a confined space. If only you could switch 'em on and off!

    John Colter.

  6. #6
    Join Date
    Sep 2008
    Location
    Leeds UK
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    Default

    Quote Originally Posted by ukantor View Post
    Neodymium magnets are scarily powerful and difficult to manage in a confined space. If only you could switch 'em on and off!

    John Colter.
    Perhaps you need something like this : https://www.amazon.co.uk/5-6lbs-Hold...dp/B008RFOI8U/

    An electromagnet can be more powerful than any permanent magnet but that might not be true at very small sizes or indeed of any specific instance.

  7. #7
    Join Date
    Jan 2010
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    1,525

    Default

    Cool. I was once fixing a crack in an inexpensive instrument. I don’t generally do repairs, so I don’t have all the gear. I wanted to keep the top in place when I glued it, so I inflated a ballon inside.

  8. #8
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    Default

    That's a great suggestion, Diblet. Worth a try.

  9. #9
    Join Date
    Dec 2011
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    Grand Junction, Colorado
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    Default

    Better to use a .010" steel string...then the hole is only a little bigger then .010"- that hole you drilled looks about 1/8"?

  10. #10
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    It was a 2mm hole, but point taken - the smaller, the better.

    John Colter.

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