Without a picture, I'm not sure what you have. If the fitting is copper, can you see the other end? If so, you could probably unsolder that one and install a new one. Then you could thread the new spout on it normally. If you have a digital camera, take a shot of it. Crop it down so it is not that big and only shows the necessary parts so you meet the max size limits of this site and post it in a reply.