Curious about the pen refill, I purchased a couple Mont Blanc rollerball cartridges and they do not fit? Is there a special designation for a proper ink cartridge?
Tactical_Keychainsthe Mont Blanc is a much finer point then the Fisher fine point thou, little smoother too.
the other beast of a Ti pen I have only takes Fisher, that's what I tend to use on my rite in the rain notepads or on the carbonless paper we use at work (the mont blanc rips holes in it)
I've also used the Fisher Space Pen refills and they work with 3 o-Rings and a spacer http://www.amazon.com/gp/product/B000Z7WVZK/ref=oh_details_o01_s01_i02?ie=UTF8&psc=1