> Give a test wiggle before trying to turn the screw - there should be minimal slop, and the bit shouldn't immediately try to "cam out". This is the number one

> Give a test wiggle before trying to turn the screw - there should be minimal slop, and the bit shouldn't immediately try to "cam out". This is the number one trick I've learned working at a repair shop. If you learn to do this, you can almost always get the screw out. In a worst case scenario, I've found that a flathead can sometimes get out a stripped torx screw, though don't try this unless there's no other option.