On the D string of my jazz bass, there is a rattle. its not frett buzz, but im sure its coming from the nut. Im not sure if this is because of the new bridge i put on, or what. what can i do? also, the new bridge was a Badass bass II. i put it on, but it didnt have the filed slots for the strings, is that bad? I just adjusted it, and put all the saddles as low as they can go, and its still has a high action. its so hard to play, and i cant even slap and pluck its so high. any help?