Hi all - I'm sorry if this is a silly question, but how do you fill a blank cartomizer? Do I need a syringe? I bought an eGo XL Cartomizer and one end is to be attached to the battery (I think) so I cannot fill with e-juice there. And the other end is just a small opening from which you vape. I cannot take the cartomizer apart it seems. Help this newbie cartomizer-user! Thanks!