I have an AGFA B2 Speedex that has the shutter stuck wide open. I've managed to figure out how to take off the front lens, but for the life of me I can't figure out how to unstick the shutter. I can't even see the shutter blades! The aperture works fine and the lenses are clean, but if I can't get the shutter loose then the camera is no good to me. Anybody out there have any clues or advise they could send my way?