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After reading your page again, I finally figured out why people are talking about sawing off the end of the bushing ... so it can be pressed out "outside-to-inside" thus avoiding the need to make a tool to bridge the other end of the a-arm, which will be in the way in a press, when you press them out "inside-to-outside".
I know it's getting old now, but again, if you just use a vise you can press the old bushings out the reverse of the way they went in, ie inside-to-outside, without the need for extra work (sawing) or a special tool. They're just rubber, it's not like they are metal pieces that only fit together at a certain temperature. They come right out.