As far as I know all the Berea Sierra pen kits use a 27/64" brass tube, both the twist versions and the click versions of the kits.
The clicker portion presses into the top end of the brass tube directly.
The nib installation, however, first requires that you press a short ring into the lower end of the brass tube.
This short ring has internal threads.
The nib portion of the kit, which has matching external threads, then screws into the threads of that inserted ring.
I am wanting to know the thread specs, and would appreciate any help in determining this. . I don't have a thread gauge for this purpose.
I have determined that the male threads on the nib portion have an O.D. of 8.7 mm ( or 8.8 ), but I don't know the pitch. . They are single start threads.
Does anybody know the pitch of these threads, please ? . Getting tap and die for the threads is, of course, another issue.
All Sierras that I have worked with use this same construction, so I assume that the threads are the same on all Sierra models.
What I want to do is make a threaded ring for the top end (clicker end) as well, and then thread the clicker portion to match.
By doing this, the barrel of the pen could always be removed by unthreading and could be swapped with a different barrel.
Similarly, the barrel could be reversed end-for-end if that were desirable.
I suppose that I might be able to get the required info by contacting the Berea company, but they might not want to disclose it.
So ... if anybody out there can help, I'd greatly appreciate it.
Yes, there is an additional problem: - the pre-installed clip would have to be removed and re-installed. . I haven't solved that yet either.
If anybody has any comments on what I want to do, please feel free to express your ideas. . Thank you.
The clicker portion presses into the top end of the brass tube directly.
The nib installation, however, first requires that you press a short ring into the lower end of the brass tube.
This short ring has internal threads.
The nib portion of the kit, which has matching external threads, then screws into the threads of that inserted ring.
I am wanting to know the thread specs, and would appreciate any help in determining this. . I don't have a thread gauge for this purpose.
I have determined that the male threads on the nib portion have an O.D. of 8.7 mm ( or 8.8 ), but I don't know the pitch. . They are single start threads.
Does anybody know the pitch of these threads, please ? . Getting tap and die for the threads is, of course, another issue.
All Sierras that I have worked with use this same construction, so I assume that the threads are the same on all Sierra models.
What I want to do is make a threaded ring for the top end (clicker end) as well, and then thread the clicker portion to match.
By doing this, the barrel of the pen could always be removed by unthreading and could be swapped with a different barrel.
Similarly, the barrel could be reversed end-for-end if that were desirable.
I suppose that I might be able to get the required info by contacting the Berea company, but they might not want to disclose it.
So ... if anybody out there can help, I'd greatly appreciate it.
Yes, there is an additional problem: - the pre-installed clip would have to be removed and re-installed. . I haven't solved that yet either.
If anybody has any comments on what I want to do, please feel free to express your ideas. . Thank you.
