A less intrusive method is to use a hack saw. With the a-arm in a vise, take the blade off the saw and thread it through the bushing. Then saw a straight line until the bushing starts to collapse on itself. You can feel the bushing start to press on the side of the blade. Use a chisel or screw driver to drive out the bushing. It still scars the a-arm but the damage is minimal.
To save time you can start with a sawzall and then switch to hack saw near the end.
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