REPLACE LOCKED-IN STUD (AVIM) (Continued)

TM 55-1520-240-23-1 1-15 REPLACE LOCKED-IN STUD (AVIM) (Continued) 1-15 REMOVE STUD WITH SCREW EXTRACTOR NOTE Use screw extractor when stud is broken off or if drill with speed below 700 rpm is not available. 9. Cut off stud (2) flush with housing (1). 10. Drill pilot hole (7) in center of stud flange (6) for screw extractor. Use drill smaller in diameter than stud (2). Do not drill through bottom of stud. 11. Install twist drill in drill or drill press. For Stud: Use Drill: MS51989-104 7 (0.201 Inch) MS51989-105 F (0.257 Inch) MS51989-106 5/16 (0.312 Inch) MS51989-107 U (0.368 Inch) MS519928-504-13 0.4375 Inch SHF101-9SA(8)A F (0.257 Inch) ST-10045 F (0.257 Inch) 12. Measure and record thickness of replacement lock ring (3). NOTE Interlock need not be cut away to full depth. Three-quarters depth is enough. 13. Drill out interlock (5) between stud flange (6) and lock ring (4). Do not drill deeper than lock ring thickness recorded in step 12. Use several light cuts. Pull back drill between cuts to clear chips. 1-24