Hi, Thanks for all your replies I forgot to say it's a 12/50. Have now changed both sides with club bought uj's and on the initial road test there appears to be no more knocking (woohoo). I tried the thicker circlips on the ebay purchased uj's but they didn't make a difference. Time and road miles will tell. Perhaps I over reacted a bit to the rubbing evidence and if it was happening all the time I guess I would know about it. I will post if anything develops. Thanks again.