The Schacht Treadle Tracker is a mini clip on a stick that can be mounted to the loom castle. Its purpose is to hold your treadling sequences or special weaving notations so that they are easily accessible at the loom. The Treadle Tracker comes with the Wolf Pup and fits into a slot in the top of the castle. The Treadle Tracker can be purchased separately and used on any loom that has a place to attach it.