TM 10-5411-201-14T.O. 35E4-178-14-42.(cont)i.Depending on replacement insert size, select a drill bit from sizeslisted below.After drilling small holes around periphery of insert, theremaining hole will be much larger than the recommended drill size.Insert OutsideDiameterDrill SizeInsert Thread Sizeinches (mm)inches (mm)1/4-280.437 (11.1)29/64 ± 0.010 (11.5 ± 0.25)5/16-240.500 (12.7)33/64 ± 0.010 (13.1 ± 0.25)10-32 & 3/8-160.562 (14.3)37/64 ± 0.010 (14.7 ± 0.25)1/4-28 & 5/16-240.687 (17.5)45/64 ± 0.010 (17.9 ± 0.25)3/8-240.750 (19.1)49/64 ± 0.010 (19.5 ± 0.25)j.Using selected drill bit, drill through panel skin to approximatedepth of insert to be installed.NOTETake care not to drill through opposite skin.k.Install long end of Allen wrench into drill chuck and insert shortend in predrilled hole and remove additional honeycomb core to one inch (2.54mm) in diameter.Leave from 1/8 in. (3.2 mm) to 1/4 in. (6.4 mm) of core atbottom of hole.1.Remove loose honeycomb and foam insulation, if applicable, fromhole.m.Degrease insert by cleaning with solvent (Item 20, Appendix E).NOTEAfter cleanlng, handle insert with clean,white gloves (Item 11, Appendix E).n.Mask skin area around hole with masking tape (Item 22, Appendix E)approximately 3“ x 3“.4-181
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