I saw the SuperMax link when it was mentioned before and thought it looked good. I will be very interested to see how it goes Michael H. I also have a spare worn sprocket that may be good for modification. At the moment I am not through the anodising on the second sprocket so all is quiet but I am sure it is just a matter of time. Probably the sandy environment doesn't help wear for your car Q8, maybe start enquiring about a new sprocket as it is never a quick process with a warranty claim.