How can I clean it completely, if soap and water won't do it? I don't want this grease to get into my ink bottles if I pump the filler several times, but on the other hand, maybe if I remove all the grease around the threads they won't seal well, and ink will escape in spite of the o-ring between the filler and the section.
I wouldn't worry that much. I think you have already cleaned it enough. Mine is an Ivory Darkness. The converter did also look yellowish to amber when I got it, Now it looks greenish, I suppose of the combination with stains of blue ink.
Plus, it should likely be greasy at the threads for the converter due to silicon grease. If it isn't you may later consider greasing them with silicon grease if you experience any leaks.
Instead, I would put it to good use ASAP.
I applied the Ease My Flex mod to mine, as you can see from the picture, and now it flexes with a lot less effort. I was so happy that I also did to a Creeper and a couple of FPR flex nibs. Now, a cheap noname clone of a Kaweco Sport to which I swapped the nib for an EMF-FPR flex, is always in one of my pockets.
I am not so keen on the plunger filler of the Ahab, I do rather prefer the piston of the Creeper. However, I do think that, in due time, the EMF mod is a natural route for flex lovers. After all, Noodler's pens are meant to be tinkered with.
But, Casotto, for now, I think you better ink your beautiful Ahab and start playing with it. It's a lovely pen and I do hope you enjoy it.
Edit: BTW, I must say that I find the color of the OP Ahab very attractive. Where was that pen when I was buying mine? Oh, well, actually I got this one because that was the only color available when I ordered (if I remember well).
Edited by txomsy, 01 May 2020 - 17:06.