Hi All, I have a used Nikon FA that I'm having Av issues with. The spring aperture mechanism for the lens mount does not retract all the way to the starting position with I remove a lens. There seems to be a little stiffness and as a results it does not retract completely. Even if I pull the mechanism into place, the camera does not recognize certain apertures while in Av mode. Anyone else have a similar problem and, if so, what did you do to resolve it? I'm not sure if the camera it worth getting repaired and it does work fine in Tv and Program modes without difficulty.