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This is the mechanism for the LU and SR Gound Signal models. The half inch shaft glues onto the bottom of the signal and steel a steel wire coupling goes between the back of the disk and the small horizontal lever at the bottom. Then insert the signal and shaft through a half inch drilled hole on the baseboard.The verticle part of the same lever is the coupled by a second steel wire fed through brass tubing to the servo actuator. The larger bracket is made to accept the ES08A EMAX servo. The smaller bracket sets the hight of the tubing carrying the steel wire in relation to the actuator lever. The video shows the signal in operation. I would advise that this model is not for the absolute beginner.