member 40 is affixed to the housing the blade actuating linkage is shown in fig3 and 4 and comprises the elongate tube 16 encasing a link or rod 18 extending through the tube and interconnecting scissor blades 48 and a thrust bearing 50 the blades project from a longitudinal slot 52 at the far end of the tube and are pivoted together in scissor fashion by means of a pivot pin 54 extending through end portions 16 a b of the tube wall the tube wall portions 16 a b define the slot 52 and extend above and below the blades blade tangs 56 extend beyond the pivot axis 54 a short distance into the tube and are there connected to an end of the link 18 each tang is slotted 58 fig3 for sliding connection of the link so that a push on the link opening the handle opens the blades while a pull on the link squeeze of the handle closes them the link at its other end is connected to thrust bearing 50 which applies push and pull thrusts to the link the thrust bearing is encased in the hand lever 40 so that by opening and closing the scissor handle corresponding push and pull forces are applied to the blade link as shown in fig3 the elongated tube subassembly is free to rotate about its long axis with respect to the stationary frame by means of a slip collar coupling 60 between link 18 and thrust bearing 50 by cylindrical bore or.