I had bought a new main frame, tail boom, and tail motor housing. I completely rebuilt the whole thing. I put the two shims in it and this thing flies like crap. I went down to one and it still sucks. I tried to take all of the shims out but when you put the blades in the grips the blade hits the retaining screw. I have tried from one to four shims per side. This thing is a piece of s#@$%!!! I don't know if the servos have already went bad or what. Everything is new except for the reciever. I put a new 3-1 in it also. I am running out of options. I have spent enough money on this thing to buy three more of them. I guess i can buy three servos. I am sick of throwing parts at this thing. I know that i am setting it up right because of the information you guys have given me. I appreciate the help alot. Maybe there is still hope? God i hope so. [:@]