Hi, Some time ago after reading that some builder put springs in their CBG's, I thought I would try it. 

Well I must have used springs that were unsuitable because the sound change was not noticeable to warrant the work in fitting them. Luckily I put a access panel in the back so that I could adjust the tension or remove them.............I removed them.

So I decided to test springs before fitting into the guitar.

Here is what I came up with. I can test their responsiveness by tapping of the back of the box and evaluating the springs vibrating  response, duration and volume. There's room for improvement, but I'll leave it there.

Taff

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