QUOTE(Ron Z @ Jan 12 2008, 12:56 AM) [snapback]475291[/snapback]
Some of the nibs have a brass band crimped onto the collar, I suspect to keep the collar from cracking, but it has the added effect of keeping you from being able to pull the nib and feed out.
Well, the Pelikan nibs with such a brass band, can have nibs and feeds pulled, IME, and reinserted too.

AFAIK, Bexley nib/feed assemblies have plastic collars, just like the Stipulas, and should therefore not pose a problem. Furthermore, some pen repair people told me that this is the preferred manner to change nibs as well, although, personally, I prefer to screw them out, if possible of course.
And I've had instances where it wasn't possible...
Warm regards, Wim