Hi, I've just finished installing a new HDD on my MacBook Pro. However, the new HDD moves about slightly as it's not a snug fit, and this makes a noise when moved. How can I fix this? On the instructions it says 'Make sure 4 rubber grommets are seated in top case before installing the hard drive'. What are rubber grommets, and are these already in the laptop or do I need to buy them from a hardware store, and are these what is required to make the drive fit snugly? Please help me out, particularly anyone who has fitted a new HDD to one of the new 13" MBPs. Oh, and FTR, it's a 500GB WD Scoprio Blue that I have fitted. Thanks.