Abstract: The apparatus includes an annular member having a pivotal member pivotally coupled to the annular member to which an elongated elastic member may be attached with the other end of the elastic member attached to a fixed object. Two clamp members are provided each of which has an enlarged base with a neck extending from one end of the base and a collar formed at the other end of the neck such that a curved slot is located on the outside of the clamp member between the base and the collar. The base of each of clamp member has first flattened portions on opposite sides of a first slot and the neck and collar of each clamp member has second flattened portions on opposite sides of a second slot which is a continuation of the first slot. The first flattened portions of the bases of the two clamp members may engage each other such that the second flattened portions and second slots extend away from each other.