Hi to all, I have an Istick 20W from eleaf from 3 months now; it is a wonderful little device; a bit overpowered, PWM, but excellent! I use it with a kayfun Lite Plus. Unfortunately, the threading from 510 connection begins to break. Most annoyingly, the positive post in the bottom of the 510 doesn't have a spring and it "sinks", making contact impossible. I saw there are some adapters from eleaf, made specifically for istick, that allows you even to fold the atty like a jack knife. Anyone uses these adapters? Are they worth buying?