Simple hinge system for use as tricopter yaw. The motor mount is designed to fit a NTM motor. I used a 5mm carbon fiber tube as the pin in the hinge. (Other materials would work, but design modification may be necessary - .skp is available in the downloads.) I didn't include a servo mounting system. I plan on zip tying and hot gluing the servo in place. A servo arm would them be glued to the motor side of the hinge.