These were fine for me thanks to all the comments. I used a CR-V PH000 from an old Maplin screwdriver set after reading above comments. I applied a lot of downward pressure before attempting to turn. The PH000 actually got lodged in the right hand screw so I removed the screw tip from the driver with the screw still attached and left it on there until I needed to put the screw back in. The mac I’m working on was second hand and was missing the left hand screw, I checked another machine I had lying around and borrowed the left hand screw and put it back in with the same PH000. Good luck!