neck shim

Hello, I have a Fender jazz bass with action I can’t get down to 2.25. The saddles are not bottomed out, but if I lower them anymore, I get buzz on the upper frets. The truss is maxed out with as little relief as possible. I was thinking of shimming, but I don’t know whether I need a wedge shim...

I picked up what was sold as a 1974 original P Bass and took it apart to take a closer look. I found the shim and calling card of who I assume installed it. Not munch information was available from the guy who sold it to me, but, just like every loved one - I'd like to know as much about the...

Hey all, I had a question regarding my Fender Jazz Professional II Jazz Fretless bass. I would like to add a slight shim to the neck (via Gary Willis' business card trick). I unbolted the neck, and....nothing. The neck appears to be glued. I tried (with some force, but gingerly) to remove...

So as the tittle says, I am curious to weather a full sized neck pocket shim, made from inserting a plastic credit card in the neck pocket, to some extend might dampen the vibrations from the strings, and thereby sound of a bass? I am asking cause that is what I currently have in my main bass...