The mechanism has two parts - a hinge section which is fixed to the hollowed out head, and the eyes which are part of a device to move them side to side and up/down. The eyes section connect to the hinge by a clamp, which allows adjustment to the eye sockets. The hinge has a return spring eliminating the need for hard wire controls, in favour of cable/cam.
The eye mechanism front view
Eye mechanism rear and cable connections
The assembly fitted to the head
The face, eyes fitted. I have made a video of the movements, but not able to post here.
Thanks for your comments. I would want to use a speed controller for the motor. Have you used speed control, and if so, is there power loss ?