First off I'm going to say, as a somewhat neutral observer, that I think both sides reacted poorly.
Metz, you come across, in this instance, IMHO, as a bit "particular" when it comes to used parts, they are used and so CANNOT be in perfect shape, at best they will have cosmetic/minor damage, this should be expected. What Butch offered for sale was a fully functional VNT turbo, which is what was delivered, you can be disappointed at the level of packaging, but it seems that was not responsible for the dent and so is immaterial to this situation. As the test showed, the dent has no effect on the functionality of the part, and so is cosmetic...
I guess the real question here is: Would you have not bought the turbo had the dent been more obvious to you? It would seem that you would have.
As for Butch, I can see him feeling like this is a case of someone making a mountain out of a mole hill, add to that the "threat" of never buying from him again, might make a person feel like it is an attempt to manipulate the seller into discounting the cost of the part and/or ambushing a future sale with a negative post or by word of mouth.
All and all, I think Butch had a bad taste left in his mouth from the sale and was acting preemptively, or out of those bad feelings. "Scammer" is probably the wrong word to use, it has a bit too negative a connotation, finicky or "particular" would be words I would have used, but when emotions get in the mix, people sometimes use a shotgun where a flyswatter would have been a better choice.
In the end its just sour grapes. Would I buy from Butch? Sure, I don't think there was any malice involved and his history bares this out. It seems it is a case of something one person wouldn't consider an issue, apparently being a big issue for the other.
There's my $.02, now can we all go back to being one, big, happy family?
Mike