Some Zorki 4 Weirdness: Ideas?

[Max Power]

Hey All,
I'm having a bit of a strange framing problem with my Zorki 4. The further I progress into a roll, the more the frame seems to 'slide down' below the lower film guide. In these last frames of a roll, below, you can actually see that the image has 'slid' down into the perforations. Before I go nuts trying to find a potential solution; has anyone ever seen this before?

Cheers,
Kent

[Bas]

The only thing that comes to my mind would be a film spool falling down, together with a film guide not enough deep.

Try putting some vinyl tape around the axe of the film spool, that should keep the film spool on its place. It is rather strange, since the film tension itself should keep everything in place, but we can safely assume that if the film is sliding down, the film spool is doing it also (unless you have found wrinkles on the film which evidence missaligning in the middle but correct position on the extremes of the film).

I'm attaching a picture to show exactly where the tape goes, (it's the white dirty tape on the right of the camera) because my skills in technical english are not as good as I'd wish :)

Cheers
Bas

[ChrisPlatt]

Have you tried adjusting the film pressure plate?

"Excelsior, you fathead!"
-Chris-