of the blades 24 26 when the sliding actuator is pulled out as illustrated in fig5 and 6 when the sliding actuator is pushed in fig4 the dimple rests disengaged in an almond shaped opening 55 formed by opposed cutouts 56 on the inner edges of the blades the wings of the sliding actuator are at times flush against the blades the narrow slots 58 in the sliding actuator are provided to clear the lower ends 28 of the rings a rivet 16 or 18 passes through the larger slot 60 the pentagonal aperture 62 seen in fig2 and 3 is created when a tongue 64 is punched upward from the lower leg the tongue extends stepwise obliquely upward from the end 66 which remains connected to the lower leg the top of the tip 68 of the tongue has about the same elevation as the inside surface of the housing and is received within a slightly raised region 70 at the end of the housing the lower leg of each actuator is retained within the housing below the blades when the device is assembled the housing is deformed by indentations 72 fig2 and 6 which extend lengthwise along each side of the housing in the region of the sliding actuators the indentations increase the interior.