hand end of the bottom run of the right hand loop of cable the cable 80 passes under the front groove of the pulley 72 and over the front groove in the pulley 70 to the top run of the left hand loop of the cable where it attaches to the other side of the carriage 68 by a threaded fitting 88 swaged onto the other end of the cable 80 this arrangement of two adjacent lopes of cable crossing at adjacent pulleys 70 and 72 in a fig8 arrangement enables the carriages 68 and 76 to move in opposite directions when the piston 62 in the cable cylinder assembly 46 is driven by air pressure in the cylinder 48 the two carriages 68 and 76 are connected to the top runs of the two loops of cable and are guided for precise linear motion toward and away from each other by linear bearings 90 and 92 fastened to the back side of the carriages 68 and 76 and engaged with rails 94 and 96 respectively the front side of each carriage 68 and 76 is milled out to provide a recess 98 and 100 respectively having four holes drilled to receive screws 102 which hold the linear bearings 90 and 92 to the back side of the carriages 68 and 76 respectively longitudinal holes are drilled through the sides of the carriage body in line with the rails 94 and 96 to receive the threaded fittings 66 and 88 on the left hand carriage and the fittings 74 and 78 on the right hand carriage 76 nuts are screwed on to the threaded fittings to secure the end of the cable to the carriages 68 and 76.