Rattling Woofer [Silver Phantom]

[egg]

Hello egg enjoyers, for a little while my silver phantom has been rattling at high volumes from one side, I always thought it was because my phantom has it's fair share of dents. However just now I decided to take a closer look at it, and low and behold that wasn't actually the case. I think the rattling is because maybe the woofer is not centered or maybe one of the internal mounts is off or something, but if I lift the bottom of the dome up the rattling disappears (or if I apply some pressure to the top side of the dome).  The rattling also ceases if I turn the phantom upside down (lol). 

I was wondering if anyone had any insight into what might be the possible issue. (from my short time on the form I have discovered that @ragwo seems to be the wise sage)