Abstract: An end of a stiff wire latching member is slidable in a heart shaped groove of a slider in such a manner that the slider latches in a depressed position when pushed once and unlatches when pushed again. A compression spring retained by a cap member urges the end of the wire into the groove to ensure proper operation. In one embodiment of the invention a cap member which retains the spring is formed with an elongated hole through which the wire may be passed for assembly, after which the spring is inserted and retained together in this manner for assembly with the slider.