I was trying to upgrade my hard drive in my pb. I got the plans from pbfixit, but i have run into a screw that is stuck. my screwdriver is the correct size, and will remove the other screws of the same size. everytime i try to remove the screen i wear down the keyed portion of the head. The screw is right above the superdrive, so i don't want to apply to much pressure. besides drilling out the screw which I would like to avoid, because metal shards would make circuts that i do not want. i've entertained using glue and an old screw driver to remove it. anyboy got any other bright ideas?