In case you were wondering how you fill a TWSBI Classic fountain pen...here you go. This is basically the same procedure for the TWSBI Mini and TWSBI 580, as well as basically every other piston-filling fountain pen. It's a good one to watch just in case you were curious how to fill a piston pen.
Some highlights in the video:
- Explaining how the pen works (0:23)
- Filling the pen (1:49)
- Getting the most ink in there (2:29)