UG70172 Harry Potter - Knight Bus™ Mechanical Model KitPunch your ticket for an exciting adventure! This DIY wooden mechanical model bus is an exciting addition to the Ugears Harry Potter collection, and a very clever piece of engineering indeed. To set the bus in motion, press down the magical manipulator button while holding the bus, then let go! The Knight Bus roars off thanks to a system of gears that transfer energy from the spring to the wheels, including a "flip" gear that lets the bus continue