Hi all, I recently purchased Yamaha TRBX504, which is a fantastic bass (thinking out switching preamp or pickups though). I've been trying to setup this bass to state-of-art condition, but I hear some rattling noise inside the cavity. The cavity cover is a cheap, thin plastic, and I think it might be the cause of this. Although the cavity is packed with wires, there is some room for rattling. Any ideas on how to solve this issue?