I took my mac apart yesterday to clean out the trackpad properly and after getting some 'help' from my grandfather (he lost 2 screws and snapped off a bit of the uppercase but i didn't have the heart to ask him to leave it alone) i tried putting the uppercase back on. it fits perfectly but the middle section closest to the screen appears slightly raised and when i go to screw in the four screws on the exterior of the laptop i can't because the hole is not at all aligned (and two of those four screws are very long). anyone know why this might be? can it be fixed/is it a common problem?