P1800 control arm bushing

I am replacing the control arm bushes on the lower front wishbones of my p1800e. This is the first time that I have changed these and although I have managed to remove the old bushes by using a butane torch and a hammer, I cannot put the new ones in as the hole in the wishbone is too tight. Is the only way to do this is to heat the wishbone hole with an oxyacetylene flame to get it hot enough or is there an easier way of inserting them. Any advice on how others have gone about this would be greatfully recived. I have alredy tried oil, clamps to push it in, etc, but no luck!

thanks

Simon