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plural handwheels
(mechanics) Any wheel worked by hand, whether used to allow leverage, as of a valve or a handbrake, or to allow fine adjustment, as of a set screw. quotations examples
When the large handwheel seen in the illustration of a 68000 class cab is moved from "stop" to "run", the traction circuit contactors are closed and the locomotive moves off with the diesel engine running at idling speed.
1964 May, “Automation in the cab—latest SNCF developments”, in Modern Railways, page 336