I know this is an old post but it is still comes up in simple HH searches. I have had the button fall off in two trucks (5T and deuce) within 6 months of each other. I dabbed a small amount of "jb weld" on each of the spokes of the retainer clip. Many years and hours on each since then, so far so good.
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M38A1, M38A5, M100, spen M100-style w/hoops, M416, M880, M890, Utica Bend M49C, Studebaker M108, AMG M109A3 (multifuel), 2-M35A2 (sold), IHC M51, 2-M51A2, IHC M52, IHC M62 (w/A2 "upgrade"
), AMG M813, AMG M817, Kaiser/Jp XM818, 2-AMG M818, M750 expandable parts storage semitrailer, M116A2 w/1-mep003, 2-mep003 stationaries, '51 IHC L-172 us army dump, multitudes of non-mil heavy trucks/equip. Looking to trade one 2000 FLD120 w/new DD60 475hp & 10sp fuller for M915A3 (same basic truck), bad knee, want automatic tranny version. Former MSG + retired heavy equip contractor . MTOC-Eng FLW, MO 1970's and other line units incl armor 'till jan91. VSG 2000's