I have a Jaguar, and the tremolo arm is getting stuck on the way down. Button in either position. However, when the guitar is sitting on my lap, with the strings up, then it bends all the way down. Stand back up, and it only goes down about half way before it hits something inside. Again, does not matter where the button is set. If I set it on my lap, hold it by the neck and bottom strap button, and rotate the body away from me, then back to me, I can hear something metal flipping back and forth inside the tremolo cavity. Any thoughts prior to opening it up? Thanks!