A track system for extended rearward movement of a vehicle door is provided. The buoyant lounger has an outer loop constructed of a plurality of releasably secured resilient foam sections. In one embodiment, the injector is passively cooled. A ball is delivered to the central location from a ball-feeding location when the second detectable signal is generated. In an alternate construction the lens structure can include a first electrode for accelerating ions and a second electrode for decelerating ions.