So I bought this lens at an antique store. It was mounted on a Pentax film camera and I wondered if I could use it. It came off of the film camera, but it wont come off of the K-1. Now I realize that this Sears lens has the dreaded Ricoh pin which is caught in the autofocus recess in the K-1 mount.
After some research, I have tried the wiggle and hope method and I have tried to get a .004 inch feeler gauge to get the pin back where it needs to be to get the lens off. The hint to toggle the autofocus switch back and forth on the camera to push the pin away from the camera is not helping. I don't think the autofocus is doing anything because the lens is not fully mounted (it got stuck) or the camera knows that it is a manual focus lens.
Any suggestions?