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Mmmhh, mine did come loose months ago and it's a bugger trying to do the nut up with its position. Since yours has been loose for some time I take it that you've been continually fastening it and with it being soft metal you've stripped the thread. I'm thinking this as I thought about that when tightening mine.
Maybe it's just the nut that is buggered?
Anyway try this. Keep the mirror pointing at 90 degrees to its true position and hold it there. Tighten the nut up as tight as you can with your fingers, then hold the nut in position with some pliers and screw/tighten the mirror and stalk. It might take a couple of tries to get the starting position so the mirror ends up central.
If the thread is stripped or too far gone you really have no alternative but to replace but you could try out the above when you get a new one.
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