f. Inspect adapter.
(1) Check orifices for burrs or blockage.
(2) Check cup retainer threads for damage.
(3) Check O-ring grooves for nicks, burrs, or any other defects which could damage O-rings during installation.
(4) Inspect barrel mating surface for nicks or burrs. If damaged, lap to repair.
3-74. ASSEMBLE INJECTOR
ENSURE THAT ALL MATING SURFACE ARE CLEAN BEFORE ASSEMBLING.
a. Install check ball into top of barrel.
b. Hold barrel with check ball up and place new adapter spiral pins into barrel.
c. Mate barrel to adapter engaging spiral pins. Be sure not to drop check ball.