I had the same design for several years until the throttle, high demand during the flights of all types, especially by helicopter, "loose" .... Despite an improvised imperfect relief, I had to resigned to order a new one from Amazon which was inconclusive at first because it was the same problem immediately upon receipt and first test (defective control !!!) no luck or failure of the realized joystick Besides that a few years ago !!!!! After returning and thus the second shipment of Amazon, I found almost equivalence my first controller in terms of accuracy and responsiveness .... it is true that with experience, we become "sharper" and probably more demanding