I take the lower control arm off the car to change them out. You've gotta change out the sway bar end links when you do, but it makes it much easier to do the drilling and cutting and grinding, and pounding. I drill out the center of the rivet, grind off one end of the rivet, then drive it through with a big punch. I like my Bonneville, but I have to say Toyota has a better idea. Their ball joints bolt in and center into the proper position with two centering nuts and a bolt. A lot easier. But, then, after you get rid of the original riveted ones, your Bonneville'* ball joint will be bolt-in too.