I suppose sometimes this can work. I tried a temporary version on my G&L SB1 by applying stick - on lead weights meant for balancing model airplanes. The bass has an extreme dead spot at D on the G string. Every other note rings perfectly. In my case adding weight just spread it to the C# as well as the D. Adding more put it squarely on the C# alone and at that point (nearly two ounces) the weight noticeably created imbalance so I gave up.Your right it was tungsten. The dead spot was very present before the procedure and afterward I couldn't hear the dead spot so in my opinion it was cured whether or not scientifically it was fixed that could be up for debate.