I just purchased a Provari to supplement my Ego-T, and I tried to use the 510 cartomizers that I purchased from cignot (Joye?? - solid black plastic including the tip, with a small hole at the end. No removable end). They don't screw all the way into the Provari and I can't get any vapor. When I use the 510 cartomizers that I ordered with my Provari, I received a different type of cartomizer (Boge???? white soft end that can be removed) and they work just fine. Is it possible that I am doing something wrong? I tried several of the Joye 510s and none will screw in all the way. Do I need to make sure to order a certain type of 510 cartomizers? (Really enjoying the Provari...huge difference with small settings on voltage. Who would have thought?) Thanks for any help you can give!!!