How to upgrade your Pilot G2 to use a Mont Blanc refill - the same that you would find in a $400 Mont Blanc rollerball. The refill I used is a medium Mont Blank rollerball: http://amzn.to/1WiOEq3
btw - amazon link is an affiliate link
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I show you how I hacked my pilot G-2 07 pen and place a montblac rollerball refill in it.