I don't use a loop. I'm draw length challenged (~27") and don't want to add the extra length. Also, I shoot a Scott Mongoose release. The single caliper configuration I believe is meant to be used to shoot off the string (only one side of the caliper moves.) I used my original string for 2+ years, shooting pretty much at least once a week, without enough wear on the serving to ever have to change it. Maybe shortening up my rig and adding a loop will get me better groups, but I shoot well enough without to not worry about it. If I do my part, the arrow does its part...