tommy2tone
Member
Why are they not interchangable? I got the twist mechanisums mixed up. On one pen the refill came out too much and on the other the refill didn't come out at all. They appear to be the same size, and I didn't have any trouble screwing them in (threads are the same). I did notice the Sierra has a longer piece on the nib than the Wall St. All is well now. It just got me wondering..