In the rules it says “A Robot is High Hanging if it is contacting the Hanging Bar, is not supported by any Hubs, and is completely above a horizontal plane that is the height of an upright Hub above the Floor(roughly 4.0” or 101.6mm)”. The game manual defines the Hub as being “roughly 4.0” (101.6mm) tall, with a diameter of 5.0” (127mm)” but the video shows the dimensions the opposite way round as attached.