Fountain pen ink cartridge installation and usage guide

Step 1: disassemble the pen barrel

Hold the pen barrel at the joint with the nib. rotate counter-clockwise to unscrew the barrel, exposing the ink cartridge port at the back of the nib.

Step 2: remove the old ink sac (if any)

If there are old or empty ink cartridges inside the pen, gently pull them straight up and discard them properly.

Step 3: insert the new ink bag (key step)

Take out a new ink bag, make sure the small end is facing down, and align it with the interface at the back of the pen tip.

Push the ink bag vertically until you hear a "click" to indicate that the ink bag is fully snapped into the slot.

Step 4: reattach the pen barrel.

Align the pen barrel with the pen tip, then rotate it clockwise to screw it back into place. tighten until secure, but don't overtighten.

Step 5: wait for the ink to come out

Let the pen tip face down and let it sit for 1 to 2 minutes to allow the ink to flow to the pen tip.

Step 6: test write and confirmation

After testing the pen on scrap paper to ensure smooth writing and consistent ink flow, it's ready for normal use.