Thanks Ari!
I am quite sure that it's for closing shutter from 'preview opening' to shoot position when insterting the film cassette, thus preventing accidentally pulling dark slide out while shutter is still open.
It's quite simple now when I got pushed to the right direction. There's microswitch that gets pushed and closes the circuit when the film cassette is inserted. Very simple system.
Ofcourse, I don't have any copal press shutters but good to know
Now if I only could be sure how should the GG frame work. If it's same as in 45C -models, then should the fresnel be above the GG unlike in Toyo cameras usually?
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