Disclosed are various devices useful as components of a system for authorizing purchases associated with a vehicle that are generally simple to install, operate and maintain and are generally resistant to abuse. In general, the sprayer system includes a cartridge holder for holding a cartridge of compressed air, a cartridge activator mechanically coupled to the cartridge holder, a pressure regulator coupled to the cartridge activator, and a passage coupled to the pressure regulator. The flexure assembly includes a metal layer where there are formed a fixing portion fixed to the load beam, main rings, and extending from the fixing portion, sub-rings, and a flexure tongue having moving-side limiter coupling portions defined thereon. In another form, the disks are axially spaced apart flat plates of progressively greater diameter extending from drive shafting at the axis of rotation. A first distributed Bragg reflector is disposed between the top end of the first light emitting diode and a bottom end of the second light emitting diode to allow light from the first light emitting diode to pass through and to reflect light from the second light emitting diode.