An assembly for an automatic garage door including a slide bar, a motor, and a drive assembly connected to the slide bar, and a tie connected to the garage door; the assembly including a first “C” bracket having a lower web, the first “C” bracket receiving the slide bar and the motor and drive assembly being operatively connected to the first “C” bracket for longitudinally moving the first “C” bracket; a second “C” bracket having a lower web, the second “C” bracket nestingly receiving the first “C” bracket, and the tie being further connected to the second “C” bracket; a latching mechanism incorporated within the first and second “C” brackets' lower webs, the latching mechanism being adapted for resisting movements of the first and second “C” brackets away from each other; and a third “C” bracket having lower web, the third “C” bracket nestingly receiving the second “C” bracket.