Yes the drill rods length are used as springs to separate the ends. The ends are done so that the sharp tips go into the template and the shoulder on the ends acts as a stop on top or the template and keeps the tips from going to deep. You place the template, then squeeze the parsers ends together and place the tips in the shield hole, then as you press on the parser and turn it the tips move and cut into the scale and being very small follow the edges of the template springing open and closed as the border changes. as they cut in the shoulders on the ends act as depth stops when they hit the top of the template. I suppose you may have to chisel out the center portion.