Hi Gezza...
The rear wheel bearing is a taper bearing and therefore it is adjusted until you have no movement in the bearing.
Fit split pin throught the castle nut and stub axle and job done...but re-check bearing play after vehicle has covered aproximately 100 miles...
hope this helps
Phil the Mechanic
P.S Dont forget to grease the bearings!...
Phil the Mechanic
October 2008