I had to remove the SSD from an elderly MacBook Air, but the tiny little screw on it was stuck on good. The appropriate Torx driver stripped it, and two flatheads snapped in the hole that remains. Here's the easy way.
You'll need a Dremel, a thin cutting disk, and a very steady hand! Then you create a larger slot without slicing the entire head, or the thing it's screwed into. Easy!