Nib interchange?

[DurocShark]

I just discovered two seemingly unrelated pens have interchangeable nib ends:

Zen from CSUSA and Jr Gent from Rockler:







Also, anybody else having problems with the cap threads cutting into the nib? It's bugging the crap out of me.

 

[Russianwolf]

Don, Neither of those look like the Zen.

 

[glycerine]

Looks like a panache...

 

[DurocShark]

Sorry, Panache, not zen. Long day at work today...