Hey Sanja,

Love what you're doing here. When I dropped some ink into the barrel it just started pouring out the nib / feed. I was using a number 6 nib / feed from fprevolutionusa:

https://fprevolutionusa.com/collections/6-nibs-and-nib-units/products/fpr-6-flex-nib-and-6-3mm-ebonite-flex-feed-combo

Do you have any suggestions on why that might be?

To be fair I tried replacing the nib with a calligraphy pen nib which might be the issue. Will try again another time soon with the standard fpr #6 nib.