referring to fig2 the shoulders 104 105 substantially envelop and abut the rear and lateral sides 24 and 26 27 respectively of the standard 14 when the lever 17 is in its closed position the lower and upper ends 108 109 of the spine 102 being substantially flush with the standard 70 and jaw link 14 respectively the notch 106 allows the upper free end 109 of the lever 17 to pivot away from the standard 14 to its open position depicted in phantom with continued reference to fig2 a pin latch hole 110 is located in one shoulder 104 at the upper end 109 of the lever 17 a flared handgrip area 112 for receiving a user 39 s fingers or thumb is at the upper end 109 of the lever 17 adjacent to the latch hole 110 referring to fig4 the standard 14 carries a lock 120 for the lever 17 the lock 120 includes a latch pin 122 that protrudes through an aperture 124 in the standard 14 and the latch pin hole 110 adjacent to and vertically in line with the latch pin 122 is a latch operating button 126 the latch button 126 protrudes through a hole 128 in the standard 14 just beyond the end of the lever 17 both the latch pin 122 and latch button 126 are attached to a springsteel leafspring 129 mounted within the interior of the standard 14 the leafspring 129 is of sufficient strength to bias both the latch pin 122 and latch button.