Screw Them Vac Fillers!
If you've ever experience or read about a problem with vac-filling pens drying up after writing for a few minutes, you will definitely want to check out this video. The solution to your problem could be so simple you'll slap your forehead. I made a follow-up video to this one that shows how to bypass this whole situation: • Removing Vacuum Filler Pen O-rings