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Here is how to build a fun and inexpensive combustion powerded paper wadd shooter or spit ball cannon.  This will take about 1 hour to build from start to complete.

http://www.youtube.com/watch?v=MBt30Dtf-iE

Step 1: Parts and Tools

You will need the pictured lighter (refillable multipurpose lighter, pen (Bic round stick) and pump(Pocket Pump from Wal-Mart or Academy).  You will also need the following tools or equivelant means.  Drill, 1/16 drill bit, 5/16 drill bit, plastic epoxy, tooth picks, razor, small phillips screw driver, quick steel(Hardware or Automotive), tape and hot glue if desired.

Step 2: Dissasemble Lighter

Take the little guy apart except for the end you use to refill under normal opperations.

Step 3: Tank Assembly and Preparation 1 of 2

Dissasemble the tank part that holds the Butane.  You might want to go outside to release the Butane pressure.  Then take a 5/16 drill bit and drill the following holes.  See Picture

Step 4: Tank Assembly and Preparation 2 of 2

Drill 1/16 hole in tank just behind exhaust hole.  Note:  Do not drill straight through.  Drill from each side to prevent plast drill bit debree from remaining in tank.  Then rethread small cap and use the original gas adjuster as a wrench to tighten.  Use Epoxy to set sparker to tank.  Note:  DO NOT EPOXY THE PART OF THE SPARKER THAT HAS MOVEABLE PARTS.  USE A FLAT SIDE.

Step 5: Barrell Assembly and Preparation

Dissasemble pen and cut white tube in half.  This is now your barrell.

Step 6: Insert Sparker Wire Into Tank

Cut and insert wires into tank.  You do not need to strip back wire.  Just put enough wire into the 1/16 hole then epoxy to seal and hold wire in place.  DO not get epoxy on any of the sparker moveable parts.

Step 7: Attaching Barrell to Tank

The pen will slide over exhaust cap and hold firmly for you to use quick steel to set permanently.

Step 8: Pocket Pump Preparation

You will need to cover the side hole of the pump stem.  If you leave a little rubber overhanbing the stem, it will act as a seal sleeve when you prime the tank with oxygen.  The rubber sleeve comes from the rubber tubbing that was remaining with the dissasembled lighter.

Step 9: Filling Tank With 91% Isopropyl Alcohol

Pour a small amount of 91% isopropyl alcohol down barrel to fill tank.  This might be 1/8 teaspoon.

Step 10: Lock and Load

1.  Use Pocket Pump to inject a small amount of air.

2.  Take 1 inch by 1 inch of paper towell and wadd it up tightly.

3.  Push wadd about 1/2 way down barrell.

4.  Aim and press sparker.

5.  May need to add air if it doesn't fire.

About This Instructable

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Bio: I like to tinker and build things that seem fun to do.
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