#flexiblenibfactory

[su-su-kang]

Flexible Nib Factory’s  ebonite feed-housing-set for PenBBS 355

These photos show that the original PenBBS housing (clear) and the Flexible Nib Factory (FNF) housing (black) have same size. 

But the FNF housing could not be fully screwed into the section. 

The original PenBBS housing went fully into the section. 

I searched for the reason and found it. 

The FNF housing had not enough threads in comparison with the original PenBBS housing. 

I modified the threads. 

And then it went fully into the section.