... I will see if the new knob adds some resistance to the film bulging...
So far as I can see by looking at the photo of the open back shown (link in post #4) the felt bar (or whatever material it is) shown on the F7 is a light barrier to prevent any stray light from the lens from fogging the exposed film on the take-up spool.
Hi
It's they way you threaded it and missed the correct slot
See here for a how-to:
http://csusap.csu.edu.au/~dspennem/photography/cameratopia/Cameratopia_Widelux/Cameratopia_Widelux.html
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