(1) There should be some play in the valve lever. To test, remove ignition shield. Compress grip safety and valve lever slowly, observing the motion of the valve needle. The valve lever should move approximately 1/16 inch before the needle begins to move. (2) Valve needle should be seated firmly in the barrel nozzle. After the valve lever is pulled back and released, no play should occur in the needle. For adjustment of needle, see Paragraph 75 _d_. _f. Screws._ Use screw driver to test tightness of all screws. _g. Spring retainer and plug._ Check tightness of spring retainer and plug (Fig 47) by using hand or very light wrench pressure. _h. Ignition head._ All exposed surfaces of the shield, nozzle, needle, and other parts of the ignition head, or adjacent to it, should be clean. If not, use cloth. _i. Atomizer hole._ With the fuel valve held fully open, insert a fine wire in the atomizer hole of the nozzle to clean the hole. Then use cloth-wrapped splint to remove from the inside of the nozzle any foreign matter pushed through the atomizer hole. If such matter is not removed, it may interfere with the closing of the fuel valve needle at the nozzle. Repeat procedure in _e_ (2) above. _j. Spring case._ Spring case should turn freely on ignition head. If it does not, clean any grease or dirt from, surfaces with cloth and relubricate. (Par 49) _k. Trigger._ Pull trigger once or twice to find whether it operates easily and whether it returns to position. If not, clean and lubricate trigger. (Par 49) Check condition of trigger spring. _l. Trigger rod._ Check position of the trigger rod when trigger is pulled back all the way as when firing. The rod should extend approximately 1/16 inch beyond the end of the lug in the ignition head. If it does not, bend the rod slightly, reverse position of bearing, or replace worn parts. 53. SERVICE WHEN FILLING AND CHARGING. _a. Inspection of fuel tanks._ Just before filling and charging, remove plugs (Par 69 _b_) and examine interior of fuel tanks to see whether they are clean and free from foreign matter. If not clean, flush with gasoline until clean. _b. Fuel level._ When filling (Pars 37 through 40), see that fuel reaches the same level in both tanks. If leveling does not occur, the tank connector may be clogged with foreign matter. If so, clean, as in _a_, above. After filling, wipe plug seats with a cloth before replacing plugs. Wipe any spilled fuel from weapon. _c. Pressure-tank valve._ Before charging the tank group with air or nitrogen, open and close the pressure-tank valve several times by hand to be sure it operates freely. If it does not, adjust as described in Paragraph 66 _d_. [Illustration: Fig 32. Testing pressure tank and valve, using 0-3,000-pound testing gage from service kit.]