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Also, while you have the dial off like that, fit and remove the stem, and understand how the bolt screw secured the stem in place by drawing the “pull out piece” or “bolt” into the slot cut in the stem.
While the stem is fitted, move it between positions and observe how the castle wheel flicks back and forth to allow setting the hands or winding.
Sorry to be a pain, but I can't see the notch... I tried removing the adjacent pinion with the flat sprung plate over it hoping it would reveal done notch but no luck...