A rudder post leaver is called a 'tiller'
One part of a boat is called a rudder.
It is called the Rudder.
That component is called the rudder.
sizing handles
Sword handles are called hilts. See the link.
rudder
neuter
It's called the rudder
The lever attached to the rudder is called a tiller.
Sizing Handles
They are called ANSA