YOU ONLY NEED ONE SPIKE. CHECK OUT THIS
SPIKE MANUALCHECK OUT FIGURE 2
LAST YEAR WE USED TWO BUTTONS ON THE JOY STICK, ONE FOR EXTENSTION AND THE OTHER ONE FOR RETRACTION BUT IM SURE YOU CAN PROGRAM IT SO THAT ONE BUTTON ON THE JOYSTICK EXTENDS AND RETRACTS THE CYLINDER.
I WAS THE PNEUMATICS SUB-GROUP LEADER LAST YEAR SO IF YOU HAVE ANY QUESTIONS FEEL FREE TO EMAIL ME.