Step 1: Parts
150 ft. 30 gauge enamel-coated magnet wire
4 1/8" rare earth magnets
4 rectifier diodes (IN4007 MIC)
Resistor (22 ohm)
Some sort of small rechargeable batteries
2 plastic washers or doodads
Step 2: Make magnet tube:
Cut your tube a little smaller than the length of the Tic-Tac box. Find some washers or plugs to use as end caps, these could also be made out of paper. Mine were plastic gears with the teeth sanded off.
Stick all 4 magnets together and put them in the tube. Glue on your endcaps being careful not to get any glue on the magnets.
Step 3: Wind the coil:
Leave 3" of wire hanging out of this slot and begin carefullly winding the coil. Winding this coil is probably the biggest pain in the ass of this project. I had many failures. There is a ton of information on the web about coil winding, but my best advice to you is go slow. The neater and tighter the wire is wrapped the more effective it will be.
When you get to the end of the coil tape your wire off and leave about 3" hanging off the end.
Step 4: Modify top:
Cut off about 1/4" of the bottom leaving 1/8" lip. Save the scrap.
Drill a hole big enough for the led to poke through.
Step 5: Make mount for switch:
Cut out a slot for your switch in the plate.
I used super glue to tack these pieces in place.