Step 1: Materials
-2 Soda bottles. I used coca-cola but as long as the bottle necks are the same it's ok.
-2 Lids to fit the soda bottles with the blue seal intact.
-A short length of pressure PVC pipe. This holds a large amount of pressure and fits very tightly with a friction fit inside of a bottle neck.
-A preferably non-brittle pen.
-Piezo electric sparker. Can be found in some lighters, BBQ lighters etc. Just need the kind with the brass contact and a single thin wire.
-Flexible PVC/plumbers' tape.
-Hot glue/hot melt gun and cartridges/glue sticks.
-A drill or a very sharp knife, but the drill is highly reccomended.
-Exacto/hobby knife. Any sharp knife will do.
-Sandpaper/emery paper or a smooth file.
-Hacksaw, preferably with a fresh blade.
-Propellant: Deoderant/cologne, butane, propane, hair spray etc. Do not use fuels such as petrol, LPG, diesel or higher combustion gasses such as hydrogen.
-Ammunition: Spit wads, potato pieces, Q-Tips, whatever you use.
-Acetone and a rag to apply it with. Be very careful with this. The fumes are terrible and try not to get it on your skin (though it removes a lot of glues).
Step 2: Preparation
-Cut a 3cm length of the PVC pipe which fits snugly into the bottlenecks. Remove the burrs and sand the ends smooth. If you have acetone, apply a small amount to a rag and use it to clean the outside of the PVC.
-Drill a hole in one of the bottle lids large enough to tightly fit your pen barrel. In the other drill a hole that will tightly fit the brass terminal and a small hole to fit the wire.
-Remove the contents of your pen (spring, ink etc.) and discard. Use the hacksaw to cut to the desired length. Trim with an exacto knife or sandpaper.