A clutch and shaft

The following is a guess from the chart belows
・There is mechanism to fix a propeller after a propeller hub horizontally.
・It links to a clutch and a lozenge with a made rod.
・The shaft is wrapped in a waterproofing tube.
・It is structure similar to “the Sterne tube” of the ships.
・The structure is complicated, and it makes operation difficult.


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