My rotating tower for Golias V2 has a new motor. I finally found the right motor to be used, a motor of an electric window of a Ford car. Stepper motor is so good but generates a lot of noise and vibration in low speeds. It was necessary to reduce the speed of the new motor with PWM. The mechanical coupling is so easy. I'm programming a PIC processor to operate the tower with its rotation motor, two servos and other devices as a spot light, infra- red light, a video-quad to select between four cameras and much more.