Hello, I recently inherited a Kowa Super 66. After successfully running two rolls through it with no problems, I decided to try the polaroid back. After taking the first shot, the mirror will not flap down and the shutter will not cock. The winder spins smoothly with its normal rachet noise, however, it does not reset the mirror and shutter and just spins endlessly. I'm not able to remove either the lens or the back, since they can only be removed when the shutter is cocked. I'm stuck. Any suggestions? Thanks in advance for any help!