The Main Pivot Screw is attached to both ends of the Main Pivot.
This Screw is what keeps the Toe Lugs and Toe Bail attached to the Main Pivot. Attaching this screw onto the Main Pivot requires two 5mm hex wrenches. You must keep one screw from turning with one hex wrench while you fully tighten the screw on the other side with the other 5mm hex wrench. Watch this video for details on how to remove and attach the Main Pivot Screws to the Main Pivot.