I usually never have anything bad to say about DAC, but this is the worst tip ever. It’s near impossible to twist. My fingers were sore for hours after attempting over and over again to make this work. I contacted customer service and they suggested kneading the putty, didn’t work. Others suggested the wax, which defeats the purpose, since I LOVE the putty, but it didn’t work either. So now I have this $10 tip just sitting in a drawer because it’s useless. The concept is excellent, but there needs to be more R&D before DAC releases new products.