p.s. called apple... they checked and asked people and checked their knowledge base and said "Nothing should be rattling... send it back". hmm.
Interesting... But does Apple know that this 'rattling' is not that loud? Maybe the noise is normal and Apple thought that its a freaking rattling noise like a car's motor eheheh. If you take to Apple, bring us the answer, ok?
The more moving pieces an equipment has, the more fragile it becomes.
Specially optics. Does anybody have binoculars? If yes, so you all know that binoculars with moving zoom tend to lose focus because of the moving pieces.