The only acceptable thing that I know of, besides a proper resolder job, is the two sided industrial grade "tape" that is used to put a higher rib on top of an existing rib. It is very popular these days to add on an extra rib to the top of the existing one in order to tailor gun fit on competition guns. It can make a world of difference if the gun does not have quite enough drop and the shooter has a tendency to pick his head up because of it. IOW, it relieves having to cheek the stock tightly.
This tape is made by 3-M, I believe, and is also used to apply body moldings to automobiles. It is thin enough to be nearly invisible, and is very durable without being absolutely permanent. The over-the-counter kind is not as strong as the industrial grade, and is thicker. I've got an otherwise perfect MX-8 that I regularly shoot in competition that has the rear end of the top rib (about 6-7 inches) "repaired" with this. It gives enough to absorb the shock of firing and, when you decide to have the rib properly repaired, it is much more easily removed by the gunsmith than something like epoxy. 'Smiths hate that, and usually charge extra just because of the extra time required to clean up the mess.
