In USA we have are supposed to be guided by a principle called caveat emptor. Which means -buyer beware. That means we have a tradition that the buyer should inform himself about what he is buying because after the trade the property is his and the money is the sellers.
That may be the case for sales in the old days, but the internet sales (ebay, etc.) call clearly for other rules. If not, it leaves the door way open for people who want to commit fraude intentionally (have a look at the "I've been screwed ! thread). Very appropriate case. According to several arguments mentioned, the seller, who obviously committed fraude, could get away easily buy saying "hey, you should have asked before buying it !!).
Unless of course there is deception involved. I don't think BB decieved him either intentionally or unintentionally he simply made the saw availible and described it reasonably well but not perfectly. He did make it clear to ask all important questions and look carefully at the pictures. In the old days this would clearly be the buyers responsibility, as it should now.
I think in this case, there is clearly deception involved from the buyer side, no ? . We all feel that BB never had the intention to cover up things, be we also admit that he could have given better description of the parts also. In such case, the buyer should have the right to cancel the sale imo.
the law still stands even without stateing it.
Doing it any other way than caveat emptor will just lead to more disputes.
I see it different, as explained.
Reading BB's last comment, that looks like a fair offer to me. If the buyer does not accept it, then the case should rest.
Roland