I have a friend's blazer here that has a worn rear U joint that is basically busted. He has to leave for practice in 2 hours. This is an 85 blazer that has the kind of u joints without a snap ring. I might have a spare that he can use. I have never taken these things apart so I need some help. How do you take it apart without a press? Use a hammer? Any special tricks? Thanks in advance for any help given.