This is rather embarrassing, but I picked up a Sega Aerocity a couple days ago and found that I don't have a tool that can remove the screws from the back so I can access the monitor. They are really small with a hex shape, but have a pin in the middle, so a hex key won't work (there would need to be a hole in the middle). I managed to get one screw out with a pair of pliers, and at both Lowes and Home Depot the employees said they had never seen anything like it. There are a ton of tools listed at Happcontrols, but they don't show the ends so I can't tell if they would work, and I'm not sure on the size to order anyway (is there a standard size for these?).
Can someone point me towards the right screwdriver, online or somewhere (preferrably) that I can pick up locally so I can work with my cabinet?