Hi Adrian, Yeah - I had that thought myself when I looked at grinding a tiny bit off the pinch bolt ends. The carb was really quite loose, to the point were it had chewed out the bottom washer with the movement of the base of the carb barrel. Seemed like the only answer. Only took a little bit off, reinstalled carb and sealed with RTV (including pinch bolts) and the carb is now nice and firm. Seems a few others have had to do the same thing going on previous posts. I was very careful nipping the pinch bolts up. It is my spare engine now as I have put a 7 Port in my buggy, so I won't be running it for a while I guess (at least I hope not, because that will mean my 7 Port has bit the dust !!!). Hoping the weather stays fine for us to get out and have a play over the weekend.