I remember someone looking for a 2nd hand car which had to be an automatic. I sent her a PM. It only took her about 3 months to read it. I think if someone offers professional advice for free in response to a question,it's polite to thank them. Frankly though if someone wants an answer, it's far simpler to just direct them to UDT. He will have one and you won't feel the need to be thanked.