When I’m shooting with insulin pins, I take out the stopper and fill from the back like you guys said to. Then I bleed out the air bubble. The air bubble does not go completely out though. It gets really small, then the tren starts coming out. I figure that this is because the needle is too small but I’m not sure. I’ve been shooting with the small air bubble left in the top. Am I taking a huge risk? I know guys have said that it takes as many as 10 ccs of air to be injected into a vein before it can harm you, but I want to ask any opinions.