I was reading that a lot of the MacBook Pro Retina laptops ship with some of the screws looser than they should be, but instead of taking it to the Genius bar, I wanted to just tighten the screws myself. To do this I needed to make a purchase. (Thanks for that Apple)
Tightening screws took only a few seconds, and was really easy. (As it should be)
Always have the tools to work on your own things, even if you never think you will.