MARINE PROPELLER JPROP Use And Maintenance Handbook page 11

6 - put the propeller on a shaft.
(We advise to use locktite on a thread)
7 - tighten the retaining nut with the Allen key type "C" and with
the help of a metal tube 30/40 cm (12/16") long.
8 - check that the propeller reaches the same position on the
shaft as marked before (see section 1).
9