Following the last 14 types of peak grip parts,
I also started developing the Ultem grip section (ebonite feeder compatible).
Because of limited materials this time,
I will limit the types to less than 10.
The grip part below is unpolished.
This is how it looks like without ink.
Below is what it looks like after it's filled.
I think the internal appearance will change over time,
but this is roughly how it is.
Since Ultem is semi transparent after machined,
For the first time in my fountain pen research,
I observed the ebonite feed flow.
It was very fascinating.
If you look at the video below, you can see the air exchange.
https://www.youtube.com/watch?v=M35-uzWixqc&t=6s
