27 again formed of any suitable metal or durable material a lower surface of which is slidably adapted to ride on the upper surface 28 of cam plate 22 affixed to cam plate 27 in any convenient manner such as by screws 29 fig3 is a second insulative conductor capturing plate 30 plate 30 is also formed to provide an array of apertures 31 corresponding to the array 14 of conductors 15 through which apertures 31 conductors 15 are freely extended actuator plate means 20 and 21 are positioned in the assembly so that as indicated hereinbefore cam plates 22 and 27 are arranged in an overlapping relationship the lower surface of one being slidably moveable on the upper surface of the other fig3 also as seen in fig3 in order to maintain the corresponding surfaces of conductor capturing plates 25 and 30 in the same planes plate 25 is affixed to an inset upper surface of cam plate 22 while plate 30 is affixed to an inset lower surface of plate 27 plates 22 and 27 have pairs of slotted equally spaced apertures 32 33 and 34 35 respectively formed therein which apertures pairs are in alignment in the unoperated assembled state of the mechanism the assembly so far described is held together by a pair of capped pins 36 and 37 fig2 which extend respectively through aperture pairs 34 32 and 35 33 of plates 27 and 22 the caps of the pins riding on the upper surface of plate 27 stems 38 and 39 of pins 36 and 37 are rotatably fitted in holes 40 and 41 provided therefor in supporting block 18 and extend therethrough into recesses 42 and 43 respectively formed in the lower surface of block 18 at this.