An automatic meter reading system that includes a head end controller and an endpoint that is interfaced to a utility meter. A spoke portion is interposed between the boss and the rim portions, and includes a spoke-edge coupling part for coupling the shells along the edges and a spoke hollow part defined between the shells. The counterweight mechanism is positioned between a center of gravity of the impact tool and the grip of the handle and is positioned above the control substrate. A first carrier substrate and a second carrier substrate are removed to expose a first circuit pattern and the second circuit pattern. The positive backrake cutter elements have a dual-radiused cutting face and are mounted so as to have a relief angle relative to the formation material. Respective retractor arms carried within each of the channels are moved to retract the body to open the surgical incision.