Thank for the replies,Sirfixalot have you used these tools and greased the bearings, is it dificult, I was told it was a job for an expert and very expensive .72 vette that was the gizmo I have seen and was hoping to get some feed back from somone who has used one as some say it will only get grease to the inner bearing and if so seems a waste of time.The use of it is mentioned in my genuine GM workshop manual so who knows?