"MASTER,SET;HARD STEEL RING WHICH WILL BE SECURED IN PWA71411 FIXT. CONSISTING OF HYD CHUCK & CLAMP/BACKUP PLATE;RING WILL HAVE RUN-OUT DIAM. USED TO IND. FIXT TO CENTRALIZE ON HORIZ. ORVERT LATHE;FOR MACH. 7TH OR 8TH STAGE COMP. AIR SEAL REAR O.D. SNAP DIAM. BY LOCATING I.D. OF PWA71415 ADAP;SERD 7682, F33657-94-C-0031"