ive made one very similar using a kimborough and cougar horn, works a treat, no more slipping the horn on the spline. that as happened to me a couple of times. but apparently the servo im using is a cirrus which as a 25 tooth spline is around 0.20 of a millimetre smaller than other servos on the spline. also the schmacher saver with the metal spring works, just need to bend the arm back a little so its 90degrees with the chassis and lightly file the top of the saver
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