Lots of them don't have a hole - its factory sealed; meaning you have to drill a new hole with a little screw device that comes with the refill kit, then you have to reseal the hole when done.
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Don't the instructions to your refill kit tell you? THe only cart. i've refilled was an HP and it went into the hole in the top where the white pin was after you pushed it out. THen put a plug in after the cart was refilled.