Has anyone had occasion to attempt a repair of this problem, or is it best
left to a professional? The ring on my FE will return under its own spring to
within approx. 1/4" of its stop, and must be manually moved to its stop
position, OR the aperture ring must be returned sharply to return it from its
start position. I am hesitant to remove the lens mounting ring without some
assurance that I won't screw something up. Any opinions or warnings?

Bob