So using a pentalobe I have managed to "wreck" a few of the heads of the screws of my air, which is annoying because now I can't get them in or out, so the creak noise is ridiculous(obviously because the screws are half in-half out.. I think the screwdriver I bought has a faulty head(I had the creaky Macbook air problem). Anyone have any idea how I can get the screws out? bit of a bad situation I'm in here, as I have probably invalidated warranty..