About the button feature...
Ever since I was able to make a fully custom fountain pen, I wanted to go further with some alternate filling systems. I considered a lever filler, but found the levers weren't readily available, and were too hard to install the parts by hand (but I'm still trying!). So I decided to try a button filler. After several attempts I had a prototype, and then a few samples that I sent to a few friends to give them a test run. After some thorough testing, I happy to say that they are now available and most of my pen styles can be ordered with this feature.
The button filler feature can be added to most pen styles that use the #6 nib, however the feature doesn't add to the length of the barrel (the length is still approx 3 1/4" (from the front of the threads to the end). It does however add a little weight to the back end of the barrel because of the internal parts (sac and pressure bar) and the filler button blind cap.
If you have any questions or would like any additional information about this new feature, please contact me.