Rope Drum Tensioner. The CleatusThe biggest advancement in rope tensioned drums since the Flam. replaces the need for the pigtail. eliminates the need for knot work on your drum. attaches to the rope with an overhand knot, no modification to the drum. Simplify the maintenance process. tension when you need it. Handmade, 3 exhaustive years of iterations and testing. Now available. Patent pending. using our 583 method and the Cleatus, a rope tensioned drum can be pretensioned in a few