Heck, they probably used it many times to cook Her Lardass’ Triple Cheeseburgers, and couldn’t figure out what that wheel is on top.
(What IS that wheel on top for, anyway?)
The other pictures at the website makes the wheel look like it lifts and lowers the grill from the fire.
http://www.grillsandcookers.com/1000-original-grill.php