In following line by Walt Whitman there are two nautical terms.
The pilot seizes the king-pin, he heaves down with a strong arm,
After searching I can say that "king-pin" could be a main handle in a wheel of a ship. And by "heave down" the poet means "pull down". I couldn't find "king-pin" in any dictionary, even nautical dictionaries. But some dictionaries say "heave down" means:
to careen (a ship) usually for repairs or cleaning
But I think "heave down" didn't applied here in this meaning.
So is there any marine man who would know these terms and help me?
(Don't ask for more context. Because every line in this stanza is an independent description and doesn't relate to other lines. All you have to realize the meaning of these two nautical terms is this line.)