The manual wasn't much help, was it? I looked, too!
Be sure not to use that breaker bar to put it back in! Make sure it's threaded properly finger tight on the socket before you use a tool. The balance is odd because the
weight is all on the rod end, so you want to be sure you have it straight to avoid damaging threads.
I used a short wrench, choked up quite a bit and tightened enough just to get it snug.
Check for leaks!