Fujica GSW690 framelines disappearing

largedrink

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I recently acquired a Fujica GSW690 ("Texas Leica"), first version. It was only after putting a couple of films through it that I realised it actually had framelines - they appeared as if by magic. Then they disappeared again.

This weekend I took the top plate off to clean the viewfinder and inspect the frameline problem. There is a metal piece with a rectangular hole in the middle, that sits behind the frameline illumination window. It pivots from side to side. I have attached two photos that show it in the two positions. In one position the framelines are visible; in the other they are invisible. When I rock the camera from side to side, I can hear the metal piece as it pivots. And the framelines appear or disappear.

After trawling the internet I cannot find a similar-looking rangefinder construction for a 690 camera that would explain this behaviour. Everything else seems to work perfectly, including the parallax correction.

Can anyone explain what's going on, or whether I can repair the rangefinder so I have permanent framelines?
 

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