A mechanism to automatically control tension of supplemental yarns added to a weaving or knitting machine has a pivotal control arm, one end of which is influenced by the tension of the yarn being controlled, while a counteracting force is applied to another end of the arm. The female portion comprises a first housing defining two slots and a plurality of first contacts. , and2) polyamide epichlorhydrin resin. The indications can be used by a processor to determine each action.