As I promised earlier here are the photos.
This first photo is of a Rollerball Converter after it has been put in a Jr Gent II fountain pen nib holder that had it's threads chased with the M6.4 x .5 tap. The photo is undoctored and the threads were not wiped off.
Here is the Rollerball converter in the Jr Gent II fountain pen nib holder. Notice the ring on the converter is seated full to the metal. This screws in and seats perfectly.
This last photo is of a brand new converter on the left, the one in the center is the one that was in the two photos above and the one on the right is a new Heritance nib and feed which is also a M6.4 x .5 thread.
I have not tried to put the original nib back into the holder but don't really feel a need to with the Heritance nib and feed holder. By simply chasing the threads of the Jr Gent II nib holder, I can now offer my Jr series pens in either fountain pen or rollerball that uses fountain pen ink. I can also offer both for the same pen. Thank you Ken for bringing up the thread chasing idea which had never occurred to me. Now there is simply no thread issue with these by simply hand turning a tap in the feed holder. It literally took no more than a minute to do this by hand. Also thank you Ken for testing this on the Baron/Navigator type pens which we also had not considered. Expect a big thank you with your order we are shipping tomorrow.
Thank you Dean for starting this thread. I think this now fully solves any threading issues. If it was not for your tireless effort on this little part it's full potential might have gone unoticed.
Thank You Ken. I have no idea what you do for a living but your mind works like an engineer or designer.
To those wanting a M6.4 x .5 tap.....
We have 24 of them on order and should be in next week or so. These can be used to chase threads in the nib holders or used for kitless configurations. We already have a couple people that have requested these. If you are interested let us know in a PM. The price will be $24 each and will be a first come first served basis. A second order of these will depend on interest.