Eugene Cernan (right) and Harrison Schmitt drive Grover; Sunset Crater lava flows visible in background.

Grover seat frame parts (upper left) and wheel mount/steering components.

William Tinnin (left) and William Wiser weld Grover wheel mount components.

William Tinnin (left), William Wiser (center), and Putty Mills attach electric motor to Grover wheel; electric motor is from B-26 landing gear and wheel is from Oldmobile Tornado.

Grover with wheels, electric motors, wheel mount/steering components, and Delco batteries attached to frame.

Putty Mills uses grinding tool to shape Grover wheel mount/steering component.

William Wiser (left) and Putty Mills adjust Grover steering mechanism.

William Tinnin used socket wrench to loosen Grover rear wheel nut; note control console structure (left).

Closeup of Grover steering and wheel motor mechanism with wheel removed.

William Wiser adjusts Grover steering mechanism.