I believe your camera has a F2 style back - the levers open and close the back. What happens when you rotate the levers down (to the right in the middle 2 photos)? I believe the lever mechanism is holding the back open. However, looking in my Sinar manuals, the back should open at the opposite end from the levers. I'm also not certain that the Graflok part is clipped in correctly. None of the photos in my Sinar manuals have enough detail to help, though. I a couple of F1 cameras, which have a different style opening mechanism on the back. Maybe you should ask who you bought the camera from?
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