The problem with using these buttons is that they were designed to be push on/push off, and I need a momentary button. Rather then buy new buttons and replace the stock ones (as is done in this Instructable by jaycollet) I figured out how to easily convert the built in button to be momentary.
All you need are a few simple tools and a little bit of motivation!
Step 1: Equipment and Materials
Precision Needle Nose Pliers
Small Gauge Phillips Head Screwdriver
Step 2: Dissassembly
There are four tiny screws on the bottom side of the light. Remove them, but don't lose them!
Step 3: Inspect the Inside
Set the shell and dome aside for now and focus on the inner circuitry. The piece of white paper is glued to the base. It is there to reflect light up and out of the top of the button. I removed mine because I plan on removing the bulb completely. There should be a couple of wires coming up from the battery compartment. One wire will go to the light bulb, the other to the switch. Another wire connects the second terminals of the bulb and switch so that when the switch is pressed, a complete circuit is formed.
Both the bulb and button should be tightly inserted into their compartments and can be easily removed by lightly pulling up on them. Do not pull by the wires or they break away from their terminals. (Unless, of course, you are going to modify the circuitry and replace the wiring anyway. Then, by all means, yank away.)
Step 4: Switch Mechanics
Very carefully remove the top portion of the switch. The inner depressor will shift forward with the cover removed, but hopefully it will not shoot off. There is a very small spring underneath of it. If the entire switch comes a part, it can be put back together fairly easily. To prevent this from happening, I suggest you keep the switch pushed down with your finger at all times. I was able to remove my finger for the picture, but it was risky business!
There are two things to notice about the switch. The first is the small metal contact piece that slides up and down as the switch is pushed. If this piece comes out, the switch will not work unless you can find it and put it back in place. The second is a metal pin in the front of the switch. It is this pin that causes the switch to lock in the on state when it is pushed, and it is this pin that we need to remove.
Step 5: Switch Modifications
If you do not have precision needle nose pliers, you won't be able to grab the pin! You may have some luck with a pair of teasers, but normal sized pliers will not fit into the gap.
Step 6: Cleaning Up
The entire push light can now be put back together, or other modifications can be done!
One thing I noticed while taking a few of these buttons apart was that the switch terminal soldering wasn't consistent. That means that sometimes the switch was wired to be closed (light on) when pushed, and sometimes the switch was wired to be open (light off) when pushed. Since the button was designed to be push on/push off you would never notice this fact, but if you are using this as a momentary button, keep in mind the difference in polarity. You may need to change which switch terminals the wires are soldered.
With the pins closest to you, the center pin is the common one. Connect the second wire to the far right pin for a normally open button, or connect the second wire to the far left pin for a normally closed button.