(6) If hose has been removed, apply anti-seize compound lightly to the threads. Screw hose into fuel-valve body. Wrench should be applied very lightly to tighten.
d. Adjustment of valve needle. Needle is adjusted after installation of parts in barrel and valve assembly. Use care when resetting needle, as smooth operation of the weapon depends on accurate adjustment.
(1) Remove ignition shield ([Par 18]) and plug from gun.
(2) Use the valve-adjusting wrench ([Fig 8]) to hold the lock nut and apply a cabinet (narrow-bladed) screw driver ([Fig 8]) in the end of the needle. Turn needle until it makes a snug fit in the nozzle opening.
(3) Compress the valve lever and grip safety. The needle should draw back into the nozzle with the tip of the needle at the smallest diameter opening in the nozzle. ([Fig 54])
(4) When the needle has been correctly adjusted, as in (3) above, tighten the lock nut with the valve-adjusting wrench, keeping the needle from turning with the screw driver. This will lock the adjustment. Screw plug into the spring retainer.
(5) Replace ignition shield. ([Par 18])
e. Maintenance of barrel and valve body.
Fig 54. Valve-needle adjustment. Solid lines show needle in correct open position with point at smallest diameter of nozzle. Broken lines show needle in closed position.