Today I found out that Centennial nib will fit perfectly into previously developed Bock/Jowo #6 ebonite feeder.
therefore a separate ebonite feed development for centennial is unnecessary.
this will help speed up the ebonite feed development process.
Also, I found out if i modify previously developed Aurora feeder,
following nibs will be compatible: M800, Sailor 21K, Omas.
in this case, a separate feed development is necessary,
because the modification is not subtle.
today i will work on Omas feeder
i will post as soon as i complete the development research
thank you.