Put blue locktite on the screws and they tighten down on a flat spot on the shaft. You can remove the front dog bone without any damage to the car. It's more difficult to control but is fun. I couldn't handle doing doughnuts all over. All of the flats should line up on the shaft like in the pic that Mark posted the link to. But Blue Locktite holds them well and you should do all the screws on the car that thread into metal.
