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EA Games Sega Genesis Security Screw Size

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Hello all!

I'm wondering if anyone has ever been able to determine the diameter of the bit necessary to unscrew the security bits that EA used on their Sega Genesis games? I KNOW that the security bits they used are called "Holt Head" and it seems like it's something more common in plumbing than anywhere else. Regardless I've been unable to determine the actual diameter of the screw head and was wondering if anyone had that information or knew of a way to measure it?

Any insight would be GREATLY appreciated!


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