Brian Puccio
Well-known
You know the rewind knob? Don't actually rewind it and don't pull up shaft, but flip up the little part called the rewind crank (part 14 in the manual) that's normally down and see if it advances then. I've heard of Bessa's having the rewing fork (part 28 in the manual) not spin freely to allow the film to advance and flipping up this allows it to start moving again.