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She traces this passion to a formative moment in her childhood when she fixed her broken cassette player by fiddling with the gear train.

Seeking a permanent place to store gear, train and gather, SMR members dedicated Saturdays over the past three years to pouring concrete and hanging drywall.

They come to me with questions, and I show them how to do things, like how to attach wheels to a gear train.

Despite these shortcomings, Price identified a gear train—a set of linked gears—that calculated the average position of the moon on any specific date by using its period relation of 254 sidereal rotations in 19 years.

A gear train using the 63-tooth gear could be designed to match a bearing on one of the spokes of the main drive wheel.