I fly an old Ultra Sport 40(3 years old not really old HA HA) I just bought it before the new one came out. But the orginal is the best looking but i dont know about performance.? well lets cut to the Question....I have 40 size hobbico mechanical retracts on it and they gitter on the runway when im taxi'ing and landing. I wonder how i can solve this. They are locked but move. The wheel mount on the rod will move every time i land b/c of this. None of the old guys have ever seen this. If you know what has happened please help !