[simplechamp]

It doesn't come with an alloy horn (for a servo that can make this much torque the included horns are pathetic, but that's the price of choosing Turnigy instead of Hitec), and Futaba spline is 25-tooth. The Turnigy servo has 25T spline, but maybe the diameter is slightly different, just enough so the plastic can still squeeze on there but alloy won't budge. Or like I mentioned maybe the Dynamite arms is out of spec/tolerance slightly. I just don't want to buy another alloy arm of a different brand only to find it doesn't fit either.