Ive heard of people doing this to get there action lower when the bridge bottoms out. When else do you do it?? Is there a way to shim to get the action even across the neck?? You see I hate the fact that some basses have a high action higher in the neck(12th or so on up) than in the first postion. I wish I could have it more flat and even. The neck is fairly straight but I would like the action lower in the upper register.