Opinions please

Yeah, give it back. But take pictures of everything you can. Pain in the butt for sure, but CYA or PYB. Stands for cover your arse, or pack your bags. It might be difficult, and uncomfortable, but get a third person if you can. If this person is this difficult on a tear down of a very badly rusted engine, he has lost any trust I may have had at one time. The old 'fool me once, shame on you, fool me twice, shame on me' routine. If this guy is unable to man up on his deal, then that leaves it up to you to be the man. Now me? I would most likely go off to the max on this knucklehead, and I'm keeping it very clean....But you have your act together, you'll do what is best for you. But whatever you decide, DO IT AND DON'T LOOK BACK! Good luck!!!!