Is it just the pins themselves on the XLR jack that seem loose? Or is it the actual bottom piece of the mic? I've noticed, oddly enough, that the pins always seem to have a little play to them, this is something I've seen across the board on most 416's. If the whole bottom piece wiggles when you move it, you can remove the little screw on the mic, and slide off the outer cover. There should be a second little screw that is now visible right by the XLR connector. If this screw is loose, it will definitely cause problems.