Amigo-person in The Sooner State has

Used, pretty decent blued old Army. As happened to me once, he ended up with one where a nipple was rusted in place. The hex shoulder has been rounded off. Probably someone forgot to clean between the nipples and inside cylinder threads, until too late. And over applied a nipple wrench.

He's bore the nipple out, and now it's thin tube of metal left in the cylinder. He's leaving the rest for a gunsmith or machinist.

So, faced with that problem, how would you deal with it?

When I had that problem in the oughts, I sold the Ruger cheaply to Mike Cumpston.