EE WAS IN THE PROCESS OF SETTING UP TO BALANCE A HOT WELL PUMP ROTATING ASSEMBLY. THE BALNCE MACHINE USES AIR CYLINDERS TO LOCK OUT EACH PEDESTAL. ONE OF THESE CYLINDERS ON THE LEFT SIDE MALFU NCTIONED. THIS ALLOWED EE ENOUGH TIME TO REACH OVER AND CHECK ADJUSTMENT ON THE STOPS. AT THE SAME TIME THE AIR CYLINDER DECIDED TO STROKE RESULTING IN PINCHING OF HIS MIDDLE FINGER.