Pinion is a component of a watch mechanism that is used to transfer power from the mainspring to the gear train. It is generally a small wheel that has a round or conical shape, with a series of teeth cut onto its circumference. The pinion is typically attached to the arbor, which is a shaft that is attached to the mainspring, and it is designed to mesh with the teeth of the gear train, allowing the mainspring to power the watch. Pinion is a vital component of a watch, as it helps to keep the mechanism running smoothly and accurately.
