Evening everyone, I have lens I’m having a problem with. It’s a 250mm for the RB 67. It’s in beautiful shape but the shutter is not working properly. When I fire it mounted to the camera it closes but doesn’t open and close again to expose the film. It could be that I am doing something incorrectly but 7 other lenses work properly. I have tried it off of the camera with the same results and on two different bodies so either something is broken or I’m not doing it right. Where is a good repair outfit that knows this system? I used a place I think in Massachusetts a couple years ago for a sticky aperture on an older Nikkor zoom but I don’t know if they will do this. Thanks. Rick H.