Abstract: The invention relates to an improvement in hunting bows, more especially in the area of the system for tracking the game by a container-stored string or cord that has its free end attached to the arrow so as to follow the flight of the arrow. The problem to be solved arises from the inadvertent failure of the hunter to "uncork" the container so as to free the string. The solution according to the present invention lies in an activator attachment for the bow and tracker string container via which the hunter, without losing sight of his quarry and without releasing his full grip on the bow, can uncork the container and thus free the string. The attachment includes a finger-actuated lever and slide mechanism whereby the cover or cork of the container, which normally engages the string, can be quickly and easily displaced.