I want to remove the steering knuckle on my td5 disco. Top ball joint is loose, but cant get the bottom to give in. Ive noticed on rave it says to remove the collect tension nut on bottom, but other people say not to and just hit it with hammer and it should break the taper? Can someone please clarify, do i just hit it (as i have been doing with no luck so far) or does that bottom collet nut need to come off?