"MASTER,GAGE,FRONT TURBINE CASE USED TO SET THE GAGE PRIOR TO PRECISION MEASURING OF THE OUTER DIA OF THE TURBINE CASE REAR FLANGE; CONSISTS OF A STEEL BAR HAVING SUPPORT BLOCK DOWELED AND BOLTED TO THE TOP SURFACE OF EACH END;EACH SUPPORT BLOCK HAS A REPLACEABLE WEAR INSERT ATTACHED TO THE INNERMOST FACE OF EACH BLOCK; CONTROLLED DIMENSION BETWEEN THE TWO INSERTS IS 25.8680 PORM 0.0002"