Mont Black (Mont Blanc Hack) - fitting the new Mont Blanc pen refills into Pilot G2 pens

Step 2 Comparing refills

Taking out the cartridge from the Pilot and uncapping the Mont Blanc refill, you'll notice right away some differences : the Mont Blanc refill is slender around the tip, and shorter than the Pilot cartridge. If you try and put it in the pen right now, it'll fall right all the way down to the tip of the pen, and of course the mechanism to push it in and out will not be able to reach.

Gladly enough, the refill comes with everything you need to make it work - a nice, rigid plastic cap. Thank you Mont Blanc !