How to Change an Ink Cartridge

If you’re new to fountain pens or just need a refresher, changing an ink cartridge is a simple way to keep your Esterbrook pen writing smoothly. Whether you own a JR Pocket Pen, a Model J, or an Estie with a cartridge/converter system, here’s how to swap in a new cartridge with ease.

What You’ll Need

• An Esterbrook-compatible international short or long ink cartridge
• A clean paper towel
• Your Esterbrook pen (JR, Model J, or Estie cartridge version)

Step-by-Step Instructions

Unscrew the Barrel
Hold your pen firmly and gently twist off the barrel from the grip section. Set the barrel aside carefully.

Remove the Old Cartridge
If there’s a cartridge already installed, pull it out with a slight tug. Use a paper towel to avoid inky fingers.

Insert the New Cartridge
Take your fresh ink cartridge and push it into the grip section firmly until you feel a slight click. This punctures the cartridge seal and starts the ink flow.

Let the Ink Flow
It may take a minute or two for ink to reach the nib. If it’s slow to start, gently squeeze the cartridge or scribble on a piece of paper.

Reassemble the Pen
Screw the barrel back onto the grip section. You’re ready to write!

Tips and Troubleshooting

• Store your pen nib-up when not in use to prevent leaks.
• If ink still isn’t flowing, dip the nib in water to prime it.
• Use Esterbrook’s 30ml bottled inks with a converter if you want more color options.

Changing your cartridge is a quick, satisfying process—and one that keeps you connected to the joy of analog writing. Explore our ink cartridges here to find your next favorite color.