Hi, I have a Nikkor 200mm f4 AI lens and the aperature ring is tight to move, especially stopping down, and it doesn't have that nice positive feel clicking into each position that my other Nikkors do. The aperature blades themselves appear to be clean and move easily. I was wondering if anyone could tell me if this is something that is not too difficult to repair (i.e. not to expensive), and/or is it something I may be able to fix myself. Any help would be greatly appreciated. Thank you, Scott
