if you haven't got a vice, you can use some threaded rod to do the same thing

just make sure it's got enough strength in the thredsa as i've sptripped one before and it gave me a bit of a scare

alternativly, use a hacksaw blade to put a cut into the bush most of the way through, this will help ease it out if all else fails, use a big weldy thing yo burn it out

just wear breathing aparatus