Ok, the first fill was a total disaster. The 1st refill actually went well! This second refill however, was, a hot mess lol. I got this carto in a PIF and it was pre "slotted"? with a dremel I presume. I have bought prepunched cartos but have never tried punching them myself. I fill by pushing the threaded end into the tank. Sometimes I bottle filled through the center hole, sometimes I took the bottom cap off. Have not used a syringe on these but that is what I'm used to - just didn't think there was room between that o-ring and the carto . . . . is there? Don't wanna damage it!!! (do you sell extra tank caps? lol)
Ok here are some photos for you...
The first thing you want to do is pull the carto into the tank, pull it down just enough so you can wiggle it and move it to side and fit the syringe in, but no further....
Next stick the syringe into the gap you created....
Then squirt your juice in!
In this photo you can kind of see the syringe in there all the way down to the bottom.
Fill until the juice is almost to the top of where the carto is sitting. The remove the syringe and push the carto back up into the o-rings.
In these photos I am filling from the top, so I am pushing the carto down into the tank so the threaded end end is sticking out further then usual. It will work the same way if you fill from the bottom, your threaded end will go into the tank just enough to fit the syringe in!