Hello. I just bought my first Bulova Accutron, a real beauty, a 1965 Bowtie with a 218D. I need to remove the movement to clear out a piece of fiber or lint that is stuck under the crystal and protruding into the watch enough for the second hand to contact it with each revolution. I do not see a release button or lever for the stem and I don't want to start unscrewing screws without knowing what I'm doing. How do I release the stem? Can someone help? Thanks!