My Core Hollowbody II Piezo has a strange rattling sound on certain frequencies, an unpleasant vibration or resonance that sounds terrible acoustically and is probably impacting the amplified sound as well. After some investigation I isolated it to the battery mechanism. If I pull the battery mechanism out of the body the vibration goes away. If I push the battery mechanism in solidly it seems to go away too. It seems that the mechanism isn’t sitting tight inside the body, causing it to rattle and vibrate. Any advice re how to fix this?