What kind of screw holds the bottom of the MBA 2013. I believe it's supposed to be a T5, but that doesn't work. In magnifing a screw head, it looks like a Pentalobe design. I have a replacement battery arriving is a few days that is supposed to come with the necessary screw driver. Hope so. I also have a set of computer screws and tried a T5, but that doesn't work. Don't want to screw up the screws in the MBA. Also, is the direction to lossen these screws clock wise or counter clockwise. I think I read somewhere that the direction is opposite normal screws.