I am at the impeller in the fort. I have been turning these blasted propellors for two hours. How do I know when I have them set correctly? They look like the way is clear, but I can't get through. Will there be a band?; a choir?; thunderous applause? or do I simply wait until the yellow arrow appears?

She'll let you know, when there's enough room.
You need to keep trying the different wrenches and clear a path at the bottom.

Thanks, misslilo.

The Haze, this is roughly how the propellors should look when they are correctly set:



The blades are as much on the gridded half as possible, leaving the lower half almost completely free.

This is a random puzzle, unfortunately.

I got it (For no apparent reason!) Thanks to all for your help reaching a rather odd ending!

Glad you made it through and finished the game. Yes, I found the ending unexpected too.