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71S0 -TOOL PROCEDURE BELOW , Caution : If the drill stop is not in the proper FOR 71SOmTOOLC , SEE PAGE 9 location failure of a pressure decay leak test may result. STEP 9A : INSERT 71S0 -TOOL OVER INLET TUBE 71 SO - TOOL To install the 71 SO -TOOL (sold separately) over the inlet tube , first loosen all three knobs , so the tool can o ' pass freely over the inlet tube flange . Align the slot on the tool with the key on the inlet tube and insert the tool down . See Figure 9A . Tool slot Loosen all Hand Tip to stop dimension knobs View holes tighten must be 2 to 2- 1 / 16 inch knobs Figure 11A evenly r, STEP 12A : DRILL HOLES ® With the inlet tube and 71 SO-TOOL in place , carefully drill a 3/ 16 " diameter hole in the upper tube o using the drill bushing in the knob as a guide . The drill stop is positioned so it will bottom out against o the knob after the bit has drilled through the upper drop tube . If the stop is positioned wrong either no Inlet hole will be drilled , or a through hole could Tube potentially be drilled through the inlet tube . If no key 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 remaining knobs . Figure 9A Figure 10A STEP 10A : TIGHTEN THE 71SO TOOL Use the three view holes to ensure that the tool seats out flat against the top of the inlet tube . To prevent vertical movement of the tool during drilling hand tighten all three knobs evenly the upper drop tube . See Figure 10A . ® Drill thru upper tube only STEP 11A : PREPARE DRILL AND BIT Confirm that the stop on the 3/ 16 " drill bit supplied with the 71 SO -TOOL is in the correct position before Figure 12A drilling . The stop is factory installed at a distance between 2 " to 2 - 1 / 16" from the tip with the 71 SO - TOOL . If the stop is not at the correct position it must be fixed before drilling . 68