How do you insert the cartridge for fountain pens?

Answer 1

It's simple. Just open up the pen in the middle (Usually right above the grip) by unscrewing the two pieces from each other. Then push the cartridge into the nib section firmly until you hear a "pop". The cartridge is now lodged (stuck) in place until you decide to remove it.

The ink cartridge will dry out in a little under a week even if you don't use it. Remove the cartridge with the nib pointing up, because the ink does stain clothing.

Cartridges are good and convenient, but a simple piston converter is recommended if you plan on using the pen every day for a few years. They refill out of a bottle, saving a good amount of money in the long run. You just have to refill more often with them. Some small fountain pens are designed to use only cartridges and will not be able to fit a standard piston converter. You'll have to buy a specially-made one from the manufacturer.