Filling

Dave Dollar Custom Pens are designed to take the "Standard International" Cartridge or Converter as well as some pens are able to be "eye-droppered". These videos from the Goulet Pen Company are a great place to start:

Cartridges: 

How to Install a Fountain Pen Ink Cartridge - The Goulet Pen Company (gouletpens.com)

  • Standard International (Short) at 2 minutes 51 seconds
  • Standard International (Long) at 4 minutes

Bottled Ink:

Using Bottled Fountain Pen Ink - The Goulet Pen Company (gouletpens.com)

Cleaning

There is no need for me to try and put together something better than what Brian Goulet covers on his very helpful website.

How to Clean a Fountain Pen - The Goulet Pen Company (gouletpens.com)

Swapping Nibs (Schmidt Cartridge-Rollerball-System)

Changing between the Fountain Pen to Rollerball nib is easy. View this video for details.