I know this is an old thread, but I recently had a JLD Bridge Doctor installed in my mid 90s D-28, a flood victim years ago. It had a minor belly problem, which is gone now. It is now unmistakeably louder and has more sustain. While that is counterintuative, I do remember violin type soundposts being installed in arch tops years ago, so maybe the Bridge Doctor acts in a similar way. I also had a compensated bone saddle and new tighter bridge pins installed so in fairness maybe some of the improvement in the sound came from that. Intonation is perfect and action is low, the way I like it.
I am now looking for a cheap but quality 12 string with a belly problem to see if it can be returned to useful life in the same way.
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