There's a tool you can get at your FLAPS (Friendly Local Auto Parts Store) for a few bucks that slides over the joint and uses a bolt to press it apart. They work great. They come in various sizes . . . If you have all but one, that's the size you will need . . . then just whack it with a hammer. The shock from a strong, well placed hammer blow will distort the tapered hole and spit the joint out before springing back to it's original size and shape (hopefully).