I currently have an old celluloid CS 479 from the early 1930s on my bench that, not surprisingly, needs a new sac. It's in very good condition otherwise. Since I have not that much experience with CS pens, I wonder if anyone here can tell me whether the section is friction fit or screw in?
Thanks a lot in advance.
P.s.: Sorry, my previous post had a typo in the title, which unfortunately I cannot edit. Maybe a moderator can remove the earlier post.