That tiny gear is made from brass, the inside diameter of that gear and the end of the thin black shaft are designed so that when the parts are new it is a press fit-interference so that the gear stays on the end of the shaft. In-between the teeth of the gear the brass is very thin. After 100s of "pulls" on the set stem it is common for the gear to come loose and fall off. I would check the gear using a magnifying glass for cracks. I have seen several cracked gears also gears with chipped teeth on older car clocks. I would not try & re-use a cracked gear.
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Peter Serio
Owner, Precision Pontiac
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