A digital camera device includes an image-capturing mechanism and a controller. The centering tool comprises a support portion having a proximal end and a distal end, two handles, and two pin placement guides, each guide having a hollow cylinder shape for the placement of a drill or pin on each of the upper and lower vertebrae. The switch includes an anode element and a cathode element separated from each other by a spark gap. The wedge may carry indicia or logos for advertising or other purpose. Such a system may be made up of a satellite in communication with terminals.