Thanks for the replies guys but I suspect bases on the BTR Drawing supplied that a non adjustable 1.2mm end float is the design intent. The reasoning is as follows:- Unlike many designs the BTR half shaft has a SINGLE bearing, so whilst in theory one can set a bearing clearance by moving the shaft inwards there is no opposite bearing controlling or setting it outwards. so to stop it moving outwards with shims they would have to be against a fixed part (axle tube) and a rotating part (half shaft). So I conclude that the end float is fixed by the bearing rollers end clearance within the bearing and is not shimable.
I assume the loads on the bearing are relatively low and what appears to be excessive end float (1.2mm) is not considered too detrimental to the life of the bearing.
