As Ross said I use the other arm and a couple of pieces of 5/8" dowel. I press the rear bushing first, lay it over the other arm with the dowels in it, use the dowels to lineup the front bushing, tap the bushing with a hammer to start it into the hole, holding it in place, then put it in the press and drive it home. Simple, cheap, quick and always ends with lined up bushings.
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