The '7' key popped off today when I was typing on my early 2008 model Macbook Pro. I searched on Google for different methods of replacing and fixing them, but they don't specify which model and, frankly, I don't understand what they're trying to tell me to do (using a toothpick to move the white spring bar? huh?). Anyone know an easy way to replace it? I've tried just snapping it back on, which makes it stay in place. That is, until I push a key next to it then push it back down again, popping it right back off. Help please?