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I made tools to hold them in position when replacing the bushings on the 1949/51 Mercury control arms. The are just adjustable support props to keep the arms centered with the inner shafts while installing the bushings. There were special tools for that purpose that Ford had manufactured by their supplier at the time which I believe was Manzel.
Since the bushings are threaded on OD and ID it can be somewhat difficult to keep the shaft centered and loose enough to rotate. The tools make it a lot easier but it can be done by trial and error. You just have to remember to keep the shaft as close to the center of the arm as is practicable. Put one bushing in first to get it to center then start putting the other bushing in while keeping an eye on the distance between the arm and how stiff the shaft is to rotate. When it's close you can play with it a bit.