[Arran]

I can't really see the point in putting something out at a garage sale if you aren't going to budge on the price, especially if they don't know whether it works or not, people go to garage sales to find bargains not pay antique store prices. In any event you get to keep your money and he gets to continue with his delusion that he has something special. There are so many pre war sets out there that you can find for the same money, if not less, and they are usually much easier to work on.
Regards
Arran