Craig, You are right on the shape of the plastic I used for the thrust tube. I did not want to get into getting around the top stuff and it would have taken more time to do, I just wanted to fly better with the guickest fix with as little work to do in one day. 30% nitro is all that I use and I never lean out all the way and my engine has never quit unless I run it out of fuel. slide it in place and do some static test and see if it shows improvment for you. There is no cost to the fixes that I did it just took about 2 hours for all of them and I went to fly the plane. If you want to get rid of it give it to me and I will put a turbine it for my second plane. I hope you try some of these fixes because we all want everyone who has one to have as much fun as I had with it at the close of last years flying season.

William