Thank you for your review. I come from collecting vintage pens as well as a core of modern fountain pens, all of which see use, and my Minimalistica is one of my favorite pens. I keep it constantly loaded with Diamine Sargasso Sea, a saturated ink that leaves a coat of blue on inside surfaces, but the bulkfiller enables easy disassembly for cleaning. The Bock stainless steel M nib is such a joy to write with that I've yet to fit the F nib that came with the pen.
I find that ink in the small lower chamber readily drains back into the main large chamber when the Conid is inverted in my pen rack. Does anyone else find this to be the case?
For me that only happens if the piston rod isn't fully seated. I typically use mine with the small chamber sealed off and refill as needed, so even being stored nib up the small ink chamber doesn't drain back.