I’ve had a number of people ask if the TWSBI Classic Fountain Pen fits in the TWSBI Diamond 50 and Diamond 50P inkwells, and indeed it does. Here’s a video showing how. This is the last of my deluge of TWSBI Classic videos, you can see all of my other ones here:

Introduction to the TWSBI Classic Fountain Pen
TWSBI Classic, 580, Mini Comparison
Filling the TWSBI Classic Fountain Pen from a bottle of ink
Writing with the TWSBI Classic Fountain Pen
TWSBI Classic Disassembly and Reassembly Demonstration

Write On,
Brian Goulet