How to use a butterfly knife by Grommet's Knife and Carry - All about butterfly knives by Grommet's Knife and Carry - Learn how to hold and use a butterfly knife -
Butterfly knife tricks should be an actual sport — tsnaks on Scorum
A Butterfly Knife Trick Worth Sharing - BladeHQ - Blog
How to Flip a Butterfly Knife: 10 Steps (with Pictures) - wikiHow