I ordered a starting clamp for the rare instances I come up a bit short on those last pulls. How do I actually use the clamp? I figured you just clamped the end of one string to the end of a piece of scrap and tensioned. When I got my clamp I realized there were little holes in the head of the clamp. Do you put the string through the holes first? Then bend it around and into the gripping part? http://www.eagnas.com/jpgp/pp600.jpg here's a picture of basically what mine looks like.