Hi Tim, there should be an outer track rod with an adaptor between it and the steering arm with a locknut on it, slacken this off, vice grips on the steering arm and spanner on the adjuster and screw the steering arm in or out as necessary.

Castor is adjusted on the leading link by lengthening or shortening in. I wound as much on as I could get but you have to watch that this doesn't drag the wheel so far forward in the arch that it fouls on the bodywork. The only caveat really is the inner mount on the lower wishbone, if it's rubber it's going to be under a little more strain and won't last forever. If it's rose jointed then no issues!

Craig has mentioned tyre pressures, i run towards the lower end with 225*50*15 on the front, back end has no camber with 345*35*15s.

Guy