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Leica IIIc question

Yes, but I would not go much passed there.
 
In reality the leica brass cassettes are designed to hold up to 40 exposures but since the counter only goes to 36 you're good to go..
 
Depends on thickness of film, PET based film can be very thin, some cine very thick.

But you would be no worse off with commercial cassettes that were not crimped.