Quick question. I have a 24" metal iMac that recently had a memory chip die. I picked up 2 new chips from Crucial and installed them. However, the metal memory isn't totally "flush" with the bottom of the iMac now. I've taken it off a couple of times and put it on, and if I feel underneath I can feel the edges of the cover pretty readily. I've tightened the screw as hard as I can but I don't want to strip the stupid thing. I really should have checked before I took the cover off. Those who own a metal iMac, are your memory covers completely flush or can you feel the edges pretty easily?