I have the lens, but I am not familiar with your issue. Does it manual focus ok at 35mm, and is there any issues zooming in and out. I would not think that the screw drive would change in any way based on focal length. It might be worth while trying to find an assembly diagram on line, and seeing if you can do some troubled shooting. Next option would be use it as a MF lens, or send it out for a repair estimate. I like my lens, so if it had a problem that could be fixed for less than $200 dollars I would do it.