the modification is a ball point pen cut to 1 1/4 length and then you notch it out to the diameter of the tail boom and it should mount like a baby then epoxy on and once it dries drill the holes for the skids to slide in you can always drill the holes first but be reall carefull not to get epoxy on main gear . it works like a champ i have a spare frame and all but i will wait untill frame i no longer any good or not repairable but she is tough just wish they make a frame plate support that wraps around motr area all the way back to aft servos whicvh will make frame a little more ridgid