"Now the next problem, there is a hell of a lot of rust on the inside of the eye, I don't want to ruin the patina by soaking it in vinegar but I would like to get rid of all that rust. I don't really know what to do."
I've used a 12 Ga. brass cleaning brush, chucked in a variable speed electric drill to clean out an axe eye. Seemed to work pretty well. I'll bet any gauge or caliber brush would work. A rifle brush might be a little stiffer and get in the narrow part of the eye better than a 12 Ga.
Tom
That's a great idea. I'll have to remember this one.