Anybody know how the seat belts lock? I am talking about the belts on rides such as Test Track and ToT. How do they lock? How do they stop the red 'release' button being pressed? I think they lock the length of the seatbelt as well as I have heard stories about people being on ToT and if you leave slack it will lock and you will have extra room although it is unsafe. How do they lock the length of the belt?