Ian,Ive got worn splines on both,and the clutch centre end plates are loose on the spider,and then the roller race is worn oversize.....Ive been tossing around solutions that dont cost and arm and leg......looking into the feasibility of making the joint a taper with six loose keys.....The mainshaft and spider are already knackered,so if I wreck them,its not a big deal.Then the rear sprocket is loose on the sleeve gear,again very worn splines........The whole gearbox /clutch needs a complete overhaul.....Ive only had it fifty years and its plumb wore out.