Preparing The Parts

1. Take the Electrical Tape and wrap it around the pen until it makes a snug fit into the cut off end of the Tylenol bottle.

2. Stick the pen into the Tylenol bottle and tape around it really good, so it is a strong, air tight seal.

3. Push the Thumb Tacks through the Tylenol bottle, like in the diagram below. Be careful, this is relatively hard to do.  If you have a small drill bit it would be much easier to pre-drill the hole a bit smaller than the thumb tacks.

4. Grab the two wires that are attached to the Piezo Igniter (white thing from the "Long Nosed" lighter), and attach one wire to each Thumb Tack. It is not important which wire goes where.

5. You are almost done. Now tape the igniter onto the side of the Tylenol bottle.

Push the button on the igniter and you should see a spark inside the gun. To use it simply stab it in a potato, to make a potato slug, then spray in a super tiny amount of propellant, put the lid on and click the piezo igniter.

Pic of finished gun

A little fuel advice for miniature potato guns:  Good fuels are Binnaca breath spray, Right Guard, or any other spudgun fuel.  Mini spudguns are rather picky on fueling.  The chamber is so small that you almost always get too much fuel.  I have came up with a process to remedy this.  Squirt a very small amount of your fuel in.  Now slowly wave the spudgun back and forth about 2-3 times.  Now cap the gun and it should fire.  If not, either try less fuel, maybe more fuel (unlikely), or varying the times you "wave" the gun.  It will work, I promise!  A side note: Make sure nothing is in your line of fire while waving the mini spudgun.