Atrax Fountain Pen Threads

[tbird1957]

Once again -
Does anyone know that size of threads for the cap
of the Atrax Fountain pen? I like the pen, but am not a fan of
the plastic threads. I though I would try and cut my own threads.

 

[crabcreekind]

they do the plastic threads so it does not wear off the plating on the male threads. Plus those plastic thread inserts on the atrax are basically invincible.

I am guessing some weird metric measurements