JDL Bridge System installation

If you have a string instrument of any kind that needs fixing, a mistake you made in building a new instrument that you need to "disappear," or a question about the ethics of altering an older instrument, ask here. Please note that it will be much easier for us to help you decide on the best repair method if you post some pictures of the problem.
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John Yungbluth
Posts: 16
Joined: Fri Feb 03, 2012 12:14 am

JDL Bridge System installation

Post by John Yungbluth »

Hobbiest here, non professional.

I'm looking at the option of installing the JDL Bridge System on a Yamaha APX 4-12 to flatten out a very bad belly issue. I have not installed one of these before. Has anyone any insight that they can share?

The picture on Stemacs site appears to show main unit resting on a back brace. But the directions make no mention of positioning it in this manner. They use the comparision that it is like a "sound post" on a violin. But do not mention that it contacts the back plate. I see in the downloadable instructions a picture that indicates 3 contact points, mounting post under the back portion of the bridge, the flat surface that sits under the saddle and the tension rod against the tail block.

Yamaha APX 4-12 have a shallow body, Neck 2-15/16" tail block 3-3/8" so I would have to cut this down to make it fit, or fabricate my own.
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Mark Swanson
Posts: 1991
Joined: Thu Jan 05, 2012 11:11 am
Location: Grand Rapids, Michigan USA
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Re: JDL Bridge System installation

Post by Mark Swanson »

The bridge doctor doesn't touch the back or the back braces at all. Just the three points you mention. So follow the instructions and good luck.
  • Mark Swanson, guitarist, MIMForum Staff
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