Occasionally we hear from some of you that short universal ink cartridges come loose inside your Pelikano rollerball or Pelikano fountain pens. There is an easy solution, and it is to place 2 universal cartridges in the pen barrel instead of just one. The trick is that the extra cartridge that is not attached to the feed or main part of the pen needs to be placed in the barrel "upside down", or in other words with the narrow end pointing away from the nib. This extra cartridge prevents the cartridge that is attached to the pen from coming off. You can rinse the ink out of a used universal cartridge and use this for the extra cartridge, or you can use a new full ink cartridge and this way you’ll have spare ink in case you need it.
This trick can also be used with J. Herbin’s refillable rollerball pens. Hope this helps!by