I've finally been able to dive into medium format after several years of interest. I have a Bronica ETRS and I recently acquired a used Speed Grip E for it. Before attaching the grip to the camera, I can see the winding connector turn when I stroke on the film winding lever. After attaching the grip to the camera, however, nothing happens when I stroke on the film winding lever (the attachment rod of the film winding crank does not turn). Please note that no film was loaded while I was doing this. Is nothing happening (the attachment rod of the film winding crank does not turn) because I have not loaded any film? Or is the Speed Grip E that I bought broken? What normally happens when the film winding lever of the Speed Grip E is stroked with no film in the camera? Thank you very much!