pairs or one pair of pivot lugs fig7 shows a dual action version of the invention using a pair of lugs 160 and 165 fitted in an enclosing wall extension of extension shaft 110 although the drive shaft and actuating link is not shown fig7 a and 7b show the embodiment respectively in the closed and open positions an actuating element would fit into the slot 140 and be connected to jaw 150 at pin hole 130 in this push to close configuration arcuate slot 155 is shown for jaw 150 and arcuate slot 185 is shown for opposing jaw 180 fig8 shows a version with a central wall 170 39 supporting a pair of lugs 160 39 and 165 39 on which a jaw not shown may be fitted and which may have a second set of lugs not shown on the opposite face of the central wall to support a second jaw the lugs themselves may be integrally machined with the fixed structure for example outer tip or the center wall as shown in fig8 to provide additional strength and stability where the slot is a simple arc additional pivot lugs for example lug 62 39 in fig9 may be added between the back and front pivot lugs or may be integrated into one continuous arcuate piece 62 fig1 to provide additional strength the type and extent of motion can.