I did finally fix my jack. After taking it apart I found a video on you tube that showed me how the internal screw shaft looked like after this fellow had a similar problem. My shaft was jammed at the top of the shaft causing it to rotate in either direction without the screw drive moving up or down. I broke it apart w/a breaker bar and a 7/16 socket. I painted a mark on the screw shaft so I will not raise the jack up to its end point again which Caused it to lock up..I now know how the electric tongue jacks operate..