Has anyone changed out the ball joints on their Travelall? I ask b/c I have a 72 1010 Travelall that I am redoing the suspension on, and the current/original ball joints are rivited into the upper and lower control arms. To be honest with you, they appear to be in good condition and they still hold grease. Do I really need to replace them and if so, how do you pop those huge rivets w/o damaging the control arms? Thanks in advance for the help fellas!