The optional System Zero Spacer offers improved balance when tripod or monopod mounting is desired. This billet-aluminum spacer attaches to the underside of the System Zero Focusing Plate and elevates the entire assembly by 1.5 inches. This extra height allows easier access to the Focusing Wheel assembly's thumbscrew and permits a more forward and better balanced placement for any tripod QR plate. Designed so that fine-adjustment of the Focusing Plate remains unimpeded. The System Zero Spacer is a very desirable option for those who routinely use a tripod or monopod.