"MASTER SET;CONSISTS OF HARDENED STEEL RING WHICH WILL BE SECURED IN PWA71411 FIXT CONSISTING OF HYD CHUCK AND CLAMP/BACKUP PLATE;RING WILL HAVE RUN-OUT DIAM. USED TO INDICATE FIXT TO CENTRALIZE ON HORIZ OR VERT LATHE;WILL ACCOMM SET UP OF FIXT FOR MACHINING 9TH THRU 12TH STAGE COMPRESS AIR SEAL REAR O.D. SNAP DIAM BY LOCAING I.D. OF PWA71450 ADAPTER;SERD 7678,F33657-94-C-0031"