I adore Naukas and I do not tire of reading about them. I have three now: the original matte black, a clear demonstrator, and one in olive-black ebonite. They are all fantastic. I want to get the orange and blue demonstrators as well. I am glad to see that someone else has five. Now I will not feel so strange ordering more.
As for getting ink in the threads, I have not found this to be a serious problem but when the clear demonstrator runs dry, I do like to take it apart and clean it. Sometimes there is ink in the cap but not very much and has not detracted from my joy in using the pen. My matte black Nauka gets positive comments if I pull it out in public. It is a striking pen.