It can be done, I've done it but, you have to think through what you're doing to avoid a disaster. Here is a very brief description of how it is done. The barrels and the rib in the loose area must be cleaned in order for the solder to stick. The barrels and the ribs must be wired together and tapered shims placed under the wire on top of the ribs. The shims are used to force the rib down when the solder melts. I wrap the barrels with wet rags to keep the heat from moving too far from the area to be repaired. When you're done the barrels will need to be re-finished. Not to discourage anyone but, this a job best left to those that are set up to do it. I was fortunate to have a good teacher for this type of work. The barrels in the picture, a new set for a 500-450 rifle, are in a special fixture that I use for such work.
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