Abstract: A pair of elongated levers are provided and pivotally connected intermediate their opposite ends and define first and second pairs of corresponding lever ends. The levers are relatively swingable in at least closely adjacent parallel planes and the first pair of lever ends each include a pair of generally parallel end portions spaced apart in generally the same corresponding plane and generally paralleling the longitudinal extent of the corresponding lever. A first pair of the generally parallel end portions define elongated channel members opening laterally in the same direction paralleling the corresponding plane and the second pair of end portions of parallel end portions define elongated presser members seated in the channel members with one of the presser members disposed between the channel members and one of the channel members disposed between the presser members.