Drive shaft end couplings ,ignore till they start crunching in the straight ahead position ,No doubt the rubber covers are split of missing so strip the end off the shaft and put the end on a small bucket of diesel the tap the round ring down on one end so the ball bearing bearing comes out and repeat this till all 6 are out ,now twist the inner part so the arms are between to holes in the cage ,then turn this till it comes out now give it all a good clean and refit in reverse procedure ,but of grease in the bottom through the hole that the drive shaft goes into fit the new rubber boot over the drive shaft and the refit the coupling fit but more grease under the rubber ,refit the boot and job done .Its a easy job to do -MESSYAND MUCKY yes but a relativly simple job