So you mean a bit more film pulled through than standard, before you close the back? Forgive me being thick but at 3.45 in the vid the start arrow is just before the white dot which seems to be the opposite, hence my question. Will have to check mine out, if you manually tension the shutter you can press the shutter release button and it'll fire, over and over. I guess if you only used the automatic cocking then it is a sort of double exposure prevention. Mine has a couple of issues so I'll need to get inside it soon anyway.