Power HD 3688HB Digital Tail Rotor Servo for 450 Helis
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Product Review (submitted on November 13, 2012):
I have had these in my 500 series heli for a while now and they have held up just great to sport flying and some mild 3D. Just dont turn them by hand or you will risk striping the gears (that goes for any servo). \The karbonite gears seem to hold up really good, but haven't put these to any hard 3D (I like metal gears for that). I would definately recommend these for a budget heli build.