An apparatus and method for preventing theft in automotive vehicle service centers. The optical splitter splits light emitted from the light-emitting device, and guides one of split light into the first dispersion generator. At other times, the flip-flop circuit can be used to deliver normal flip-flop functionality. A centralizing ring maintains the outlet end of the tube aligned coaxially with the cutting assembly of the hydro-cutting system, but is difficult to bypass during insertion of the tube into the housing. The geometry data set represents a folded object in three-dimensional space, where the folded object has one fold for each knee point in the polyline. A back is connected to the rear edge of the platform along a lower edge of the back, the back projecting upwardly from the platform.