I once had a customer much like this who approached me about some work. He asked about my guarantee and about my return policy and he asked for an estimate. I gave him an estimated range for the work. He, with his nose elevated slightly, said (and I quote), "Surely, my good man, you can be more precise than that!" I said, "Well I sure can. It won't cost you a dime because I don't want to work for you". I then turned around and walked back into the shop. I heard him telling the store owner that he wasn't done talking to me and that I had treated him "like dirt under my feet". The owner called back, saying the man said he wasn't done talking to me. I hollered back, "Maybe not but I was done listening". I heard the owner say. "Well, I guess that's it then." I figure I had dodged a bullet and felt good about it. For some reason, there are those who feel that any artisan should approach them with deference and show nothing but gratitude for being allowed to take their crap. It doesn't always work that way. Many years ago, I learned the ability to "just say no" meant less stress and more money. Kind of a win/win.
I've spent considerable time with a lap to correct barrels produced by those "brothers on the east side of the ocean" and installed by world class 'smiths on this side. Sometimes those Ferlach boys screw up too!