If you can clean the area of dirt and oil, Brake Clean seems to work well, you can work a solder and flux paste into to the loose area, clamp it in place an using a propane torch get the metal hot enough for the metal to melt the solder it can work. I have fixed 101's, Brownings, and several MX-8's. It doesn't last forever, but it can last as long as the factory job. I have the best luck with the Gun Smith solder in an tube that Brownells sells,
Jim