To Brian, Jack, Jeff, and Joy - I truly appreciate the kudos but I'm afraid they were awarded prematurely.
I went out and bought the 1/4 inch drive items and socket mentioned in posts #27, 28, 30, and 32. Better but I still can't get 100% of the socket firmly onto the nut. The header pipe sticks down in that area just enough to interfere with the socket getting a hold of the very top of the nut.
Between my newly purchased items and the crow's foot I mentioned earlier I thought I had it tight enough. However, when I started the bike up, there's a significant leak right at the rear header exhaust flange. I feel like those nuts are pretty tight so this leads me to believe that the gasket got disconfigured enough to cause the leak, even with the flange properly tightened. I didn't put a new gasket in because I never really had the header all the way off the studs but now my conscience is starting to make me regret that decision.
So, is everyone else thinking it's a gasket problem?
Much as I hate to remove the exhaust again, I think I can do it fairly quickly now that I've done it once. I've got new exhaust gaskets in the toolbox so maybe I'll replace both if I'm taking everything off.
The more pressing problem will be when I reassemble the exhaust and have to deal with that one nagging nut again. Is it possible while I have the exhaust off to have some kind of metal or machine shop put enough of an indentation in the problem section of the header that the socket will get full access to the nut? I'm sure it's only a matter of a couple millimeters. Would that much of a small dimple affect the flow of the exhaust too negatively? Not that I plan to make exhaust removal part of any kind of monthly routine but I want to be able to get full access to that darn nut!
As a side note, I got so frustrated with all of this that I made an appointment for Hellbender Harley to come get the bike next Tuesday and see what they can do. If I can get some guidance from you folks and decide to dive back in, I can always cancel the service appointment.
Man, sorry for the long post but I had a lot on my mind!