Disco Stabilizer but only the part you need, half the weight, twice the leverage for flight tracking or ability to stabilize flight.
Bigger (version 2) servo guard opening.
Doubles as a prop guard. Works MUCH better than other stabilizers that have control surface too close to center of Disco mass, the further back the control surface is the smoother the tracking. To date these are the best stabilizers in high winds that I have used.