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The base of the propeller blades resting in the propeller's center hub.

A museum volunteer saw me photographing the propeller and warned me that when the plane was being restored, a complete propeller could not be located and so the propeller was a mix of parts. I had noticed that the propeller seemed to use two different types of gears for adjusting the blades' pitch.

Picture 1 of 6.

This is the base of propeller blade #1; note the fine teeth on the pitch adjustment gear.