I have a pheonix v5 and the issue I'm having is getting it to fire on my MVP2. I have read on here that sometimes the center pin on the rda has to be pushed down from the top. Its not a great rda and came with a small allen wrench. Im guessing I would insert that into the center post into the screw and tap lightly down on it? Can I over do it? Should I attach it to an old ego battery while tapping it down or just have it sitting on a table?