Thank you for your post, my question really is directed at the phone customer you have already tried everything with. Use analogies, assure them that whatever price will most probably be inaccurate, point out what unknown variables, offer COMPLIMENTARY inspection of the possible issue, etc etc. End of all that I'll sometimes get, "Yes I understand you make a lot of sense, but what if its the water pump. It looks like its leaking from there. I JUST WANT A PRICE."