Norm, I found that out too. The chonda (in this case a Honda) fan is the exact same diameter and I thought you might be on to something there. So I pulled it off a wreck and it ends up about 15mm too high, probably more to give a safe clearance. Thanks for your help Norm. I will wait and see how those rods go. I think it's probably a crap mower anyway - it's a Tecumseh- the carby leaks as well.