Just thought I would share this.
I have a friend with a scrap yard and asked if he had any round stock kicking around. Wouldn't you know it the very next day he shows up with the rusty old bar pictured below. I asked him what I owed him and he said a beer. I think I owe him a few. I tossed the old rusted hunk in the lathe and 45 minutes later I had a new polished up bucking bar for back riveting skins. Amazingly it feels very well balanced and fits great between the rivets.
I am not a machinist just kicking around.
It works great and kind of fun to whip up a tool instead of waiting for delivery of the commercial stuff.