TM 55-1520-240-23-1
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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.
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