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|  3. 6.19.9 Tooth typc lockwashers. - T o o t h - t y p e lockwashers shall bc used
for making electrical bonds for supprcssion and external grounding purposes
(see 3.11. 1.I.
12. 1)
to other mcals of securing aluminum or magncsium structural parts which
d o not require removal when the equipment is serviced or for joints which w i l l
3. 6 20.2 . Method -- -rivetingc
. ------ of . --
MachIne riveting shall be used wherever
practicable and shall be installed by the prssure (squcczc) method. Loose ,
.crackcd, or badly formed rivets, in eluding protruding countersunk rivct
hark, shall be replaced before acceptance of the item. Excess metal
shall be removed from counter-sunk-head rivets.
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