I have a C12 back that I can’t reset.Turning the crank backwards doesn’t reset the number wheel.I can wind it forward and it will transport film.It will mount on the camera body and the camera will transport film but because the frame counter won’t reset the shutter will not fire.When the darkslide is removed it makes no difference-the back is “telling “ the camera that the slide is in.I presume opening the back up and rectifying the counter problem would solve my problems-My question is-has anyone had a similar problem and how was it rectified?I am mechanically inclined and I’m not worried about losing the back.