OK, I bought a syringe to fill these things as I could not get the provide blue tip to work. I injected .5 ml into the hole, making sure the needle was completely inserted. Everything was fine. Worked great. Put the ecig down on it's side like I normally do on my desk. When I went back to vape, I got a ton of juice in my mouth. Do you have to keep the PV vertical to use these things? Why would they design it so badly if that is the case?