as is best visible in fig3 and 4 the recess 65 is a generally u shaped recess the actuator body hole 36 is located in the recess 65 and is preferably a general oval oblong opening with a longitudinal axis extending co planar with to a longitudinal axis of the rectangular actuator body the u shaped recess 65 with its oblong hole 36 is bordered by a left right actuator walls 67 69 and top recess wall 71 the actuator grip 37 of the first embodiment is a ring like portion extending from the lower part of the actuator body web 63 for operating the actuating means by pulling other shapes are also possible the actuator body 35 is mounted to the slot by the stemmed fastener 41 the stem 42 of the fastener 41 projecting through hole 36 the stem 42 of the fastener is long enough to also project through slot 13 of the support leg 7 of the bracket body 3 the fastener 41 is provided with a large circular head the inner surface 45 of the fastener head 43 lies against the rear surface 11 r of the support web 11 of the support leg 7 and prevents the actuator body 35 from falling out of the slot 13 at that side of the support leg this is also visible in fig1 the end portion of.