Hi to all of you! I recently bought a FED NKVD 1c. It worked fine, but when I loaded the film somethig gone wrong and the camera jamed. I take apart the camera and resolved the problem. Now I can't make the curtains to work propertly. What to do? Any advice? P.S. should I consider replacing the curtains because they have some small cracks! Thank you, Mihai Besliu!