Problems installing PowerBook RAM

Hi everyone. I just ordered a new shiny 1GB stick of RAM for my powerbook. It's sitting here in my room waiting to be installed, however, this Craftsman 00 x 1-1/2 screwdriver refuses to take out the screws underneath the computer. I was wondering if anyone had any recommendations as to what, then, I need to buy to get this thing open so I can run my computer at a better speed.

Thanks

 

I've never opened the bay before, nor have I ever used this screw driver, so I don't think I stripped it. The problem looks like that at the end of my 00 Craftsman, the tip curves upwards at a sharp angle, so much so that it wouldn't allow for any leverage for opening up the screws inside the computer, if you catch my drift. I just assumed that since it said 00, it would work, since I heard you needed a 00 to open up a Powerbook.