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Jeffhs, I have a 1964 19" monochrome space command portable that is in good working condition, and can verify that the tuner is smooth all the time with the manual knob. The motor is part solenoid. Meaning that the motor shaft retracts when it is not moveing so it does not mesh with the drive gears on the tuner, and extends when it is moving so that the gear on the end of it can mesh with the gear(s) on the tuner.
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