I agree with the other guys here also. when you tie your loop, grab your release and nock an arrow and check your clearance. I like them to almost touch when I first tie my loop on. that way after a few shots the cord should strech to the optimum nock to release caliper clearance. after you get your loop on you can make fine adjustments in your nock height by threading the loop up and down the string serving. then attach a crimped on nock against the top knot or tie on another peice of serving string to stop loop movement. DO NOT FORGET TO BURN THE ENDS!!!!