12 cords!!?? Good LORD, I'm envious!

Tough call on that bolt. In that situation, I'd be doing overnight soaks with PB Blaster. The forced 17MM would be my next move.

Can you get behind the flywheel to get Blaster on both sides? Doubtful you'll get a tap into it, but hope springs eternal, and miracles happen every day.

Keeping my fingers crossed for ya, lush90. I'm guessing vice grips are out of the question, but a PB Blaster soak first will at least increase your chances, whichever way you go.

In a similar situation, after the soak, I also replaced and tightened the other bolts, to take some stress of the stubborn one, then managed to get it off. The other bolts then were removed.

Again, this is simply stacking odds in your favor.