Regarding the nut, it's penetrating oil, time, and a good impact driver.
My story (pun intended
) is that I have a bunch of air tools that could take apart just about anything. However, in my garage it took 5-10 mins or so to power up the compressor (loud), get the hoses out, lube the tools and get ready with an impact socket.
Then I saw this offer from HD on an cordless impact wrench that used all my same Ridgid batteries. After looking at all the reviews, I bought one.
https://www.homedepot.com/p/RIDGID-1...11SB/303037082
Holy Mother of your preferred deity, IT'S AMAZING!! I say that lightly. I was trying to remove the exact same bolt from an unbolted bearing and housing assembly from my "Puzzle rebuild". I wrapped a rag round it to limit it's movement, grabbed it and put the bigass socket on it...and pressed the trigger. I took almost 10 seconds before it started to move and 5 secs longer... it was off.
It's not often I say that a new tool changed how I use tools... this one has. If you can afford $150, just buy one.
Just my opinionated two cents.