Is there some special trick to cocking the shutters on old Voigtlanders? I did my antique store sweep today and first came across a folding 6x6 Perkeo I. It was in rough shape, so I figured it was just broken when I couldn't get the cocking arm to budge. Next store I went into had a folding 35mm Vito II that looked to be in excellent shape and everything I tried to move moved, but again, I could not get that darn cocking arm to move. They looked to be similar in design, so I'm wondering if there is some sort of trick to them that I'm missing? Or maybe they both were just broken?