Yes, I left out the anti-rotation tube because they sent me the wrong part. It was a solid rod and weighed .7 ounce. Jason Shulman uses the short 12mm tubes as anti-rotation pins in his Impact. I was going to build it stock but I wasn't going to wait another month or more to get the anti-rotation tube from C-ARF. When they ship parts from Thailand they must ship them on the slowest boats from China. When I waited for the replacement hardware they sent me an email on December 28 and I didn't receive the parts until February 6. Not the fastest customer service.

I checked the stab fin on my Impact. I taped on the rudder and set it straight and eyeballed it and set a square along it and it appears to be staight.

Thanks.

Kelvin