Abstract: A gyral-linear actuator for an encoder comprises an actuator housing having a first end, a second end opposite the first end, and a hollow. A control member extends from the first end of the actuator housing. A spring is positioned within the hollow of the actuator housing. Moreover, a coupler has an encoder connector and an extension that couples the control member to the encoder connector. Under this configuration, when the encoder connector is coupled to a rotary shaft of the encoder, rotation of the control member causes corresponding rotation of the encoder connector so as to turn the rotary shaft of the encoder, and depression of the control member causes corresponding depression of the rotary shaft of the encoder operating a switch function of the rotary encoder.