Then, you turn it over and use a small screw to drill a hole for the injection needle. Whenever there is the least bit of ambiguity in instructions, I can always be counted on to make the wrong decision, and it was no exception here. As I figured out later, and as common sense should have told me, the smaller screw was to tap and the larger screw to plug. Once you've tapped the hole, you fill up the ink as before. Then, plug the hole with the screw and remove the tape covering the hole.
Ink starts to percolate from the vent hole, so have some paper towels underneath the cartridge.
Using a syringe, you push 5 cubic centimeters of air into the chamber through the vent hole on the top of the cartridge. After waiting the recommended 10 minutes to ensure successful pressurization, you reinstall the cartridge. The black printed cleanly on my first try. It is similar to the other two but comes with a CD-ROM that has instructional video that shows you how to refill various models. And the printed instructions didn't even mention the need to re-pressurize the unit.