I confused matters earlier when Axeman got back to me so here is the definitive version of my question...
So far I have got the decoupler and rear difflock knobs off easily. What I can't figure out is how to get the front difflock knob off. It has a special mechanism to avoid accidental engagement of the front diff and so seems to have nothing to grasp with pliers to unscrew the knob as you do with the other two.
If anyone has got a quick idiot's guide then this idiot would be very grateful


Thanks,
Pete