How to fill a pneumatic cartridge fountain pen

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Take off the cap and unscrew the cartridge from the body.

The disassembled pen.

Dip the nib into the inkwell, it should be fully immersed.

Turn the plunger screw to cause the plunger to move up and down. Do this a handful of times to fill the cartridge with ink.

Wipe down the pen, especially around the nib and grip, which have crevices where ink deposits hide.

Reassemble the pen.

Voila! Now go write your masterpiece.