Fitting Instructions - H4 Marine

Select a 5.1mm drill and using a M6 taper-tap, followed by a M6 bottom tap, tap a thread into the equally spaced holes in the propeller boss, sufficiently deep to allow a minimum threaded screw depth of 12mm (0.375”). (Hint: if screws are too long remove excess length so that approx 12mm thread is available for screwing into the prop.) ................
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