Back in the day when I did all my own stuff I had an impact driver. I wish I still had one. It was great for stuck and siezed stuff. The one I had took bits and sockets and was very useful with stuff like that. You don't need to exert as much force, and you aren't hitting the objects directly. I'd find me one of those puppies & some pen oil. Don't rush it. Tap and squirt liberally. You don't want to remove threads or round the head. It can cause cussing.
