This probably sounds really stupid, but i going to ask anyway:

THe tracking on my cabriolet is MILES out, so much so that when going in a straight line the steering wheel isn't straight, i tried taking the steering wheel off and moving it round, but then its out the same amount but in the other direction. Obviously im going to have the tracking done, but how do i get the rack dead in the middle so i have even amounts of lock in each direction? At the garages they just put the wheel straight and adjust them dont they, and i dont want un-even lock.