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71S0-TOOLC PROCEDURE BELOW, Caution : If the drill stop is not in the proper FOR 71S0-TOOL , SEE PAGE 8 location failure of a pressure decay leak test may result. STEP 96 : INSERT 71SO-TOOLC OVER INLET 71 S & TOOLIC TUBE To install the 71 SO-TOOLC (sold separately) over the inlet tube , first loosen the thumb screw , so the o tool can pass freely over the inlet tube flange . Align 5t the slot on the tool with the key on the inlet tube and insert the tool down . See Figure 913 , Tool Slot Hand tighten thumb Tip to stop dimension o screw must be 1 -3/ 16 " to 1 - 1 /4 " O p z o Figure 11 B Loosen thumb screw STEP 128 : DRILL HOLES With the inlet tube and 71 SO-TOOLC in place , Inlet carefully drill a 3/ 16" diameter hole in the upper tube Tube using the hole in the 71 SO-TOOLC as a guide . The Key drill stop is positioned so it will bottom out against the tool after the bit has drilled through the upper E drop tube . If the stop is positioned wrong either no hole will be drilled , or a through hole could potentially be drilled through the inlet tube . If no hole is drilled return to step 11 and check the stop dimension . If a hole is drilled through the inlet tube or into the screw hole the assembly is not salvageable . Drill (2 ) more holes in the two Figure 9 Figure 10 remaining guide holes . STEP 10B : TIGHTEN THE 71S0 -TOOLC o Ensure that the tool seats flat against the top of the inlet tube . To prevent vertical movement of the tool during drilling , hand tighten the thumb screw against the upper drop tube . See Figure 1013 . r STEP 11 B : PREPARE DRILL AND BIT Confirm that the stop on the 3/ 16" drill bit supplied Drill through upper tube only with the 71 SO-TOOLC is in the correct position before drilling . The stop is factory installed at a distance between 1 -3/ 16" to 1 - 1 /4" from the tip with the 71 SO-TOOLC . If the stop is not at the correct Figure 126 position it must be fixed before drilling . 69