Funky useless golden thingy on my MD???

Does anyone know whats the purpose of this little golden hole is, which is on the bottom of any of my Megadrives? It is located at the right upper corner if the Megadrive is turned upside down.

To me it looks like a screwhole, so I thought it could be to adjust something.

I opened the Megadrive and found the pcb hidden in a metal box, I don't know but i guess this box is to ground things, if something wents wrong.

The screwhole now is not connected to anything in the inside of the Megadrive, but if you

would screw a long enough screw in it it would touch the metal case in the inside, so you would get nowhere?

Whats the original purpose of that hole and what is screwed in there?
 
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