Unfortunately for you "all sales final" means wha it says. I doubt ebay will do anyhing for you. I've always said if you buy something used thats a chance you are taking. I would guess that it will work. Its probably something simple. Hopefully for you its something simple. I have 2 featherweights that I found at sales and flea markets. Buying one that you can't see first is risky.
Judy in Ohio