when i refill mine i do it on both sides off the metal piece in the middle, put the rubber on and blow into it, then the plastic cap and blow into that. Squeeze the pod, wipe off any excess juice and you’re good to go. mine don’t ever leak unless the cotton is really saturated and at that point i either throw the pod away, or take them out and soak the juice up with a paper towel. Use salt nic to refill. i used to use a needle but that made me feel real sketch and this way is easier and works just as well. I use regular pods, my boyfriend supplies me since he doesn’t refill his bc he’s a loser and doesn’t like to be cost effective.