The depth of the cut from the wire to the bow handle is going to be the length of the Extension Arms, plus 7-inches. Note that the curve of the handle may interfere with the last 7-inch depth of the cut.
The Extension Arms should be clamped, taped, or screwed into the Bow at their base. There is a 6-inch extension at the end that holds the wire that can be rotated to tension the cutting wire.