nikon f2 film winder.....

[fstop]

I pulled out an F-2 that was not loaded, the first stroke of the film advance does not engage the sprocket, you have to give it a full stroke and fire it, on the next stroke it will advance.

 

[E. von Hoegh]

I pulled out an F-2 that was not loaded, the first stroke of the film advance does not engage the sprocket, you have to give it a full stroke and fire it, on the next stroke it will advance.

That's the double exposure feature in action, you don't have to tighten the film and hold the rewind knob either.