The rover's camera motion is panned from an actuator at the base of the
mast. Numerous wires route within the mast to service the cameras,
antenna, tilt motor and sensors that reside on top. The mast pans more than 360 degrees, which imposes substantial twisting and spiralling on the wires. Since the wire bundle is so dense, and moves so much, the mast is mocked up to experiment with the details. These parts assemble to emulate a mockup of the mast and its panning motion.