I made a fairly short video showing how to make your Kaweco Sport into a Bulb Filler.
This is very simple and wont take long. All you need is the Pen, of course, and a razor blade, #18 sac, empty cart, ruler and shellac.
To help promote and spread the word about Fountain Pen Day I will try and upload a new video once a week. It may be a neat trick like this or a pen, ink or paper review. If you like the video then like it and share it!
Heres an updated picture outfitted with a clear sac from David Nishimura