Would this really be necessary? I just clamped the control arm in a vise on the longest side, then tightened up the ball joint with a long breaker bar. Or at least, I initially did that before just using a high torque impact while still in the vise, since it was a lot faster. First threaded it in by hand as far as it could go to prevent cross threading though. Recommend repainting the arm if you clamped it in a vise as it'll likely leave marks. Clamping the arm down like this at least saves the new bushings from being subject to the amount of force that tightening the ball joint with a breaker bar will generate, and it saves having to fab up a custom tool.
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