These bushes are a complete b*****d
I took mine to be removed by an engineer mate who's been restoring classics for years. After pulling some faces, three hours (£75), an acetylene torch and burnt hands, we finally got them out. Taking the s/a off was enough of a hassle as the spindle refused to budge, we had to destroy the rubber in the bushes then cut the spindle to release the s/a. When the s/a was off, it was a case of trying to remove the outer metal shell of the bush from inside the s/a, which is almost impossible when removing the first one as you can't even bash it out from the other side. Had to mangle the thing from one end and keep cutting/bashing until it gave up.
Then, on refitting, they pressed in ok but the spindle wouldn't fit. The bushes had to be reamed out until the spindle would actually go through. When I got to fitting the s/a to the frame, I discovered that the s/a eyes/lugs had been bent slightly and the spindle wouldn't go through. Lost my temper and got a big hammer only to almost ruin my new spindle. All this took me about a week (just to get the s/a sorted).
I think my mate saw the fury but pointed out that, now fitted, the bushes would probably outlast me - one to leave for posterity.