upstate, SC United States
When I had my trex 600 nitro I got a club memeber to show me haow to tighten this. You tighten one side against the seesaw and then take your hand and squeeze the other side back toward the seesaw. You then tighten it down. It is tricky but it works. If you want to do the cut down thing then file the ends of the cross bars evenly with a file and measure each time. you will want to measure the gap first and divide it into two. File the little bit of material off each side. Repeat on the other. I did it both ways and they both worked great. The oly problem with the shim is you get the flybar holder off to one side that way. Either of the above things should help.Fly it like you stole it!
Stick Banging Expert