My dad has a 4001 Ricky '76 bass. Now 4003. Anyway the second PU has a bridge cover over it. I thought it would sound better without the bridge. It took up a lot of space and without out it you could play right over it. So we did remove the cover. It did a little more than I thought (and my dad, too). It held some screws and springs in place holding the PU down. So we had to dig out the screws and springs put those back in place. Now the PU itself rattles but no feedback or anything. It is a lot louder now though. But my dad did call our local music store that said a replacement part that fits the rest of this empty space around the PU to stop it from rattling is made...Where can I find this piece?! Thanks in advance guys.