Dremel (rotary tool)
Note: I understand that this isn't a real Taser, or stun gun for that matter. It puts out around 10,000 volts, but with an unreasonably low amperage; too low to harm someone. You can feel it but the pain it inflicts is minor. This project was made just for fun, and isn't meant for self defense.
here are some videos of me messing with my piezoelectric "taser"
Step 1: Dissassemble the Lighter
Step 2: Crack Her Open.
Step 3: Remove the Plumbing.
Step 4: Remove Butane Tank
Step 5: Remove the Piezoelectric Igniter
Step 6: Project Box
Step 7: Electrodes!
DO NOT SOLDER!
The Piezoelectric is heat sensitive. I found out the had way that heating it with your soldering iron will break the piezoelectric igniter.
you can, and should, solder the wire and metal strip to separate electrodes.
Tape the contact metal and electrodes. Leave half a centimeter of each electrode untaped.
Step 8: Assemble and Glue.
Mix up a small amount of epoxy and put all of it on the bottom of the piezoelectric igniter. Place the piezoelectric igniter on the bottom of the project box with enough sticking out of the square hole to be pushed inward and click, creating a spark.
Spread the inner wires as far as possible; the spark will find gaps in your tape job if the wires are too close. Spread hot glue on the innards, holding the electrodes in place and insulating the rest.
Let the glues curate and go shock someone (you can also put the candy back!).
The shock isn't strong enough to incapacitate someone, but it does hurt somewhat; especially if the contacts aren't touching the skin. You can use the "taser" to light the butane from the tank in your dismantled lighter.