There are two different types of these cartridges. The older type has a single vent hole and the newer type has two vent holes.

DOUBLE HOLE MODEL

Locate the refill plug (top right of the cartridge).  Using the eyelet screw provided twist it into the vent hole 3 or 4 times and pull the plug out.  You are now ready to refill the cartridge.  Place the cartridge on several layers of newspapers.  Inject up to 20ml of black ink into the cartridge.   Pause occasionally and let the sponge soak up the ink.   The cartridge may not take all the ink since it may not be totally empty.

SINGLE HOLE MODEL

Locate the refill plug (top right of the cartridge) .  Enlarge the vent hole using the hand drill provided.   Place the cartridge on several layers of newspapers.  Inject up to 20ml of black ink into the cartridge.  Pause occasionally and let the sponge soak up the ink.   The cartridge may not take all the ink since it may not be totally empty.

Replace the plug on the BC-01.  Nothing needs to be done to the BC-02.

Replace the cartridge and run a priming cycle as per printer instructions.