yet more!

Yet another noob question My steering wheel is way off centre although the car drives perfectly straight, i just find it bugs me its not aligned. So i removed the centre boss but how in G's name do you remove the plastic cap underneath? It seems to sit under the lip of the wheel? Am i missing something blatantly obvious? Help

you should centre steering if way off by removing steering linkage to pas box and refitting and fine adjustment on dragl ink