The heads of the screws holding the hard drive to the drive carrier in my Mac Pro are badly stripped. I have tried numerous methods such as using a rubber band for added grip, different screwdriver heads, different screwdriver head sizes, and so on. None succeeded. The heads are quite thin (it is a MacPro4,1) not the thick ones like MacPro1,1, so it is alost impossible to grip the head on its edge with a pair of pilers. I am going crazy... Can someone please help?