Thanks again for your patience. This is a weird one, I'm not sure what to recommend. I've never seen anything like it before. You say this pin holds the window up, but I'm not sure how. Can you go into more detail? What exactly is its function?
i think there was a spring around the end of the mechanism. so you would screw the peg with the spring then pull out when yu wanted to adjust the window. very vintage..:)
L