I will add a comment about the ball screw. After the soak as Keith suggested when you go to move it back it up first. There seems to have been two methods of fitting these screws. One method used a taper thread. The other used a straight thread but the hole was tapped to full depth all the way through the knuckle. Either way the screw is getting pretty tight just prior to coming to it's final position. It will normally back up easier than it will go forward. Then it can be turned back in the needed amount. Turn it in just enough to put the barrels back on face but don't use it to bring the top lever around to the right, this results in an incorrect fit of barrels to breech.
As Lefevers do not have a "Compensating Spring" in the forend many will feel a bit loose when open. This is of absolutely no consequence if they bolt up tight & on face.
