Get a socket the right size of the nut, one with 6 sides is the best. Just use a bench grinder and grind down the socket for it to go in place. Heat the center a little and try to remove the center part with hex nut. You can also drill 4 holes in a piece of metal to make a hub holding device. They say air guns will remove the hex very easy. Time to find some friendly neibor that may just help you. Good luck Capt,n