Working our way toward the center of the suspension, this is the connection between the control arm and the ball joint (through to '73). For 1974 Supers, the ball joint is pressed into the control arm rather than bolted to the bottom of the strut. For our '71, remove the self-locking nut, and use a fork (or puller if you so have one) and separate the arm from the ball joint. Use a lot of WD-40...we can't stress this enough.