What lever under the wind lever?
Dear E.M. : What lever are you talking about? I looked under both the lever that cocks the shutter and the lever that winds the film and other than the multi-exposure lever, I don't see anything. Can you provide a picture? Are we talking about a Pro-s body and back for sure? Ric.
That lever - could it be this...
E.M.: I'm still not sure what lever you are talking about, but could it be that one in the middle of the back? That is for releasing the wind stop so that you can wind the whole roll through the camera should you want to. However, that doesn't have an arrow on it. So I still don't know what you are talking about. Ric.
P.S. Can you send a picture attachment of it?