I slap an angle finder on the handle in the sagged down position and see how many degrees it's off horizontal. Remove handle, clamp square end in vise, heat red hot and twist shaft up the number of degrees it was down. You must hold handle in line while twisting or the shaft will bend to one side or other. When reinstalled the handle will often point up with the door open but drop back horizontal when shut. This eliminates the spring having to retain it's tension. The latches were of such a terrible design that I refuse to let a truck leave the shop without bear claw latches or at least safety belts. If they don't want either they can take them somewhere else. Many a kid, including me, has fallen out of one of these trucks when a door popped open.
