How to Make a Balisong / Butterfly knife from a Wrench (NO FORGE METHOD)

About this video

ZNA Productions constructs a butterfly knife by repurposing steel spanners and flat bar stock, carefully designing the blade shape and handle to ensure proper balance and motion. The build emphasizes material temperature management during grinding, precision drilling for pivot pins, and aesthetic finishing with paint and riveted assembly. Through testing, the host demonstrates the finished knife’s functional opening and closing action while reflecting on the creative problem-solving required throughout the project.

Key takeaways

• Temperature control during material processing is critical—ZNA uses the dunk-and-grind technique to prevent overheating and damaging the steel’s factory temper
• Mistakes can lead to unexpected improvements; drilling holes slightly off-center allowed for a beneficial taper adjustment that kept the pivot centered
• Hand finishing with progressively finer abrasives (scotchbrite pads, buffing compound) achieves results that power tools alone cannot, requiring patience and time investment
• Designing for full range of motion and smooth operation requires careful attention to pivot pin sizing, spacing, and placement—forcing oversized components can sabotage the final mechanism

Episode details: published January 19, 2017 · 1.9M views · 20:07 long. Summary written by Self Growth Videos from the episode itself. ZNA’s builds are his designs and experiments, covered here as commentary on the engineering ideas — Self Growth Videos does not publish build instructions, and his weapon-style projects should not be replicated.

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