"GAGE ASSEMBLY,SHIM CHECKING;A CYLINDRICAL BASE,THE BASE IS COUNTERBORED AND SIZED TO FIT OVER THE END OF THE MAIN SHAFT,A SLIDING TAB IS ATTACHED TO THE BASE W/A SMALL FINGERSCREW,THE SCREW RESTRAINS THE TAB FROM SLIDING,FUNCTIOIN TO MEASURE-PROTRUSION OF SHAFT TO DETERMINE AMOUNT OF SHIMS REQUIRED TO OBTAIN A BUILD DIMENSION OF 0.560 PORM 0.005. OPERATION,INSTALL GAGE ON MAIN SHAFT, ADJUST TAB UPWARDS TO CONTACT UNDERSIDE OF SHROUD FLANGE,LOCK ARM IN PLACE,MEASURE AND RECORD DIMENSION, SIZE 2 IN. DIA. X 3 IN. H;WEIGHT 2.5 LBS;MATERIAL, STEEL;FINISH, PASSIVATED;SERD NUMBER 240099"