Sleeve Fillers

The sleeve filler was not one of the more common fillers used in the early fountain pens. Looking at vintage examples, the sleeve would be friction fit to the barrel when fully closed or fully open. That would scuff up the barrel a bit more each time it was used. It also meant that it could potentially slip.

I wanted something more secure, so I put a touch of four start thread in the center of the sleeve — just enough to tighten when the sleeve is closed, but also to hold it open when filling to make it easier to use.