Thanks for your valuable info. I do keep a lookout on ebay often, sometimes too often:D. I have had the pinion rebuilt,fitted and it is rather fine. My only worry is that the brass used may be not be the most ideal, but it will hold for some time till I get a substitute. I have just finished a 4year resto on an Armstrong Siddeley 346. Had other plans to start restoring one of my other cars but chose this Champ. It is a challege but I can see it ready in 3 years.