After two days of working on the old jack I have given up. The screw is seized so badly into the jack that there is nothing I can do. The aftermarket jack is just to dangerous to keep using so I will need to replace it. I really like the idea of using the welded on snap ring mount so that I can put a spare tire mount on the drivers side of the trailer. I found jack that should work with the weld mount and is not too expensive.