How to fill an eyedropper-filling fountain penUpdated 10 months ago

One of the oldest pen-filling methods is the eyedropper. Instead of using a mechanism to draw ink into the pen, the user transfers ink into the barrel by means of a syringe or eyedropper. Since the pen barrel lacks a filling mechanism, it has the highest capacity to carry ink

1. To fill, pour ink into the barrel until the level reaches the inner barrel threads.
2. Keeping the barrel upright, screw on the section.
3. It is recommended to apply a small amount of silicone grease to the section threads for a watertight seal.
4. To help prime the feed, perform the last turn with the nib down, over the bottle of ink or rag.

Pens like the Opus 88 fountain pen are designed to prevent leaking and ink burping with additional o-rings and a shut-off valve. While it is possible to convert some cartridge/converter pens into eyedropper fill, one should do so with great care to ensure the pen will not leak.