(1) It is very important as with all cartridges you want to make sure that you cap within 30 seconds of filling and to cap simply place the mouthpiece on push it down and begin twisting in a clockwise direction to tighten it once it is completely.  It is easy to leak oil If you not cap and seal up in time.

(2) The cartridges filled with oil needs to be placed vertically. Don’t put it horizontally when the cartridges finish filled, it is easy to leak oil when it is placed horizontally.

Unscrew the metal mouthpiece,the one special thing to note with the cartridge is that it does not have a center post to fill through, this center post right here is actually the air channel, what you want to do is fill to the side it is a side filling cartridge,  so to begin filling you want to place your needle to the side of the center post but inside the glass.  Once you have your needle placed correctly to the side of the center post simply begin pushing your material inside don’t go too fast cause you don’t want it overfill and  as you approach your desired volume simply withdraw the needle,  and this is very important as with all cartridges you want to make sure that you cap within 30 seconds of filling and to cap simply place the mouthpiece on push it down and begin twisting in a clockwise direction to tighten it once it is completely.