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🧰 Required Tools & Equipment

✓ Utility knife
✓ Hot glue gun
✓ Scissors
✓ Rotary punch or small drill bit
✓ Ruler

📦 Materials & Supplies

✓ Empty 500ml Coca-Cola plastic bottle with cap
✓ Retractable ballpoint pen spring
✓ Wooden skewer or plastic dart rod
✓ White nylon string or yarn (2-3 meters)
✓ Velcro wrist strap or wide elastic band

⚠️ Safety Checkpoints & Warnings

• Always cut plastic moving the utility knife blade away from your body and hands.
• Let hot glue cool completely before touching seams to avoid severe burns.
• Never point the finished web shooter mechanism at eyes or faces during assembly or testing.

📋 Step-by-Step Guide (5 Steps)

Cut and Trim the Bottle Neck

Use a utility knife to slice off the threaded neck of the Coca-Cola bottle roughly 1.5 cm below the support ring. Trim any jagged plastic edges with scissors so the base sits completely flat against a table.

👁️ Camera AI Checkpoint

• Threaded spout cleanly separated from bottle body
• Base sits flush without rocking when placed cut-side down on a flat surface

🛑 Watch Out For

• Cutting too close to the threads, which weakens the glue surface
• Leaving sharp, jagged plastic burrs along the cut perimeter

⚠️ Safety Note: Place the bottle on a cutting mat and slice downward away from your fingers.

Hole Punch the Cap and Guide Tube

Punch or bore a clean 3-4 mm hole through the exact center of the Coca-Cola bottle cap. Ensure the hole is slightly larger than your wooden skewer or plastic dart rod so it slides freely without friction.

👁️ Camera AI Checkpoint

• Centered, round opening drilled through the top of the red plastic cap
• Dart shaft slides effortlessly back and forth through the hole without catching

🛑 Watch Out For

• Drilling off-center, causing the spring mechanism to jam
• Making the hole too tight, stopping the dart from launching smoothly

⚠️ Safety Note: Secure the cap firmly in pliers or against a wood block before drilling; do not hold it unsupported in your palm.

Assemble Spring Plunger and Dart

Slide the pen spring over the wooden skewer dart and secure a small cardboard washer or bead 2 cm from the rear end with hot glue to act as the spring stop. Thread the forward end of the dart through the cap hole so the spring rests compressed between the rear stopper and the cap interior.

👁️ Camera AI Checkpoint

• Spring sits trapped securely behind the cap hole on the shaft
• Plunger retracts and rebounds smoothly under finger pressure

🛑 Watch Out For

• Using too much hot glue, which leaks into and gums up the spring coils
• Placing the stopper too far forward, limiting spring compression travel

⚠️ Safety Note: Ensure hot glue is fully cooled and set before testing spring tension so the stopper does not snap off.

Create the Trigger Catch

Cut a small L-shaped plastic tab from the discarded bottle wall to serve as the trigger catch. Glue the trigger hinge to the outer neck assembly so its front notch catches the rear end of the cocked plunger rod until pulled.

👁️ Camera AI Checkpoint

• Plastic catch firmly holds the compressed dart in cocked position
• Light upward finger flick on the tab reliably releases the dart forward

🛑 Watch Out For

• Gluing the trigger tab completely rigid so it cannot flex or release
• Making the catch notch too shallow to hold the spring under load

⚠️ Safety Note: Point the front of the barrel at an empty tabletop while testing the trigger engagement.

Tie Webbing and Secure to Wrist Strap

Tie one end of the white string securely to the tip of the dart and wind the excess loosely beside the barrel. Use hot glue to anchor the flat base of the bottle neck assembly firmly onto the center of the velcro wrist strap.

👁️ Camera AI Checkpoint