I don't remember how I found out about this, but Swisher Pens sells a Waterman stock Stub nib for the Carene. It is not on their website - I had to ask for it, but they ordered it for me and it arrived this week. Man - what a fantastic stub it is! I love stub nibs - I have many from Richard Binder, but I have to say this is the smoothest stub I have ever used. And, it is so cool to see a great stub nib on the tip of that beautiful Waterman inlaid nib!
I have 2 Carenes - the Amber Shimmer and Deluxe Blue models and now I can use the interchangeable stub in either one as the mood moves me.
Just thought I would share my new pen experience with all of you!
JK