I have a P Bass which was customized to be strung through the body, with ferrules on the back of the body. Last night I was changing the strings, and one of the ferrules came off. It looks as though they were simply pressed into the holes. When the bass is strung up, they are naturally held in place. My question: Can anyone think of a good reason NOT to use a little glue in this situation? It's a bit annoying to have one (so far) pop out every time I change the strings. Oh yeah, one more thing: My luthier said this, and I agree: "Stringing through the body does little or nothing for the sound... but it's good for the mind."