It you still have the gun, any competent smith can handle that.
The saddle is only soldered to the upper barrel so you can put heat on it while the two are together.
If I remember correctly, the ring around the lower barrel is a snug fit but is free so that the barrel can shift with windage and elevation adjustments.
It certainly doesn't compare to a full relay. With the number of builders on this site, I am surprised that nobody else chimed in.
What I would do after it is corrected, is to send it out to get cryo'd and that would probably take care of any stress imparted by heating the barrel up when soldering.
I have seen cryogenic treatment work wonders on a number of guns.

Good luck and sorry about the late reply.

Cheers,

Tom