Instead of a barrel cover, built-in piston or button systems may have a “blind cap” over the screw knob or button.
Squeeze and release the converter again. Repeat this process until bubbles no longer appear in the bottle of ink and your pen is full.
You may need to raise and lower the piston a number of times to completely fill the pen with ink. Remove any air pockets. If the ink converter was totally empty when you started, you might notice that you can’t fill the ink all the way to the top due to a pocket of air. To remove the air pocket, twist the plunger counter-clockwise to empty all of the ink along with the air, then refill. [4] X Research source Squeeze out a few drops of ink. Remove the nib from the ink, and twist the piston counter-clockwise until a couple of drops of ink come out. This will prime the pen for writing.
You can also use a syringe instead of an eyedropper.
As the plunger reaches the wider, flared part of the pen, it will break the vacuum and cause ink to be drawn into the barrel. [5] X Research source
You might need repeat this step a couple times until the pen fills.
