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Liked the pic of thd guy in the gas station suit putting on the spin balancer. These were great as they balanced the wheel and drum, on the car. The little round knobs on the center of the device were held briefly to change the weight and location. Was spun up by an electric motor. One checked for (balance) by watching the antennae for shake, or rest your head on the fender.
June 1942. "John Sonesen, propeller grinder at a Hartford, Connecticut, plant, inspects a blade for a vertical balance during the operation of grinding it to correct contours in a template. This Hamilton blade will be assembled in a pitch-controlling Hydro-Matic mechanism to help power one of our new warplanes." Photo by Andreas Feininger for the Office of War Information.