A laser pointer that used LR44 batteries.
3 AAA batteries.
at least 4 1/2 inches of 1/2 CPVC pipe
6 inches of 14 gauge wire
Needle nose pliers
Then bend an "S" on the end of the 6 inches of 14 gauge wire. Once again, 14 gauge was critical, as 12 would not fit, and 16 was too loose. I am remodeling my house, so I used a piece of ground wire. Magnet wire would work well, but don't forget to sand off the insulation where it touches the battery terminal, and where it touches the inside of the case of the pointer.
Then, put a battery with the bump end (+) touching the "S" of the wire, and slide this into the pipe.
With the "S" flush with the end of the pipe, there should be 1 (one) inch of the Negative side of the battery protruding, and about 1/2 (half) inch of wire.
Then press the negative end of the AAA assembly into the pointer.
The wire will go INSIDE the pointer.
Make sure the "S" bend of the wire is on the terminal, not beside like the photo shows.
Replace the cap if you so desire. The "S" can be bent so it helps keep the cap on if the cap is too loose in the pipe.
I had to stand the completed assembly upright on my desk, and push everything together tightly to get all the batteries and wire to make contact.
Step 5: Thoughts
I get tired of holding down the power button, so I taped the button down, and I made a wire with a longer "S" bend. A turn of the wire was all it took to turn the unit on and off. However, this quickly wore through the side of the batteries, and they shorted out, getting REALLY hot really fast!
Why not paint the pipe to match the pointer?
I don't know how long the AAA batteries last. It's been a month, and the dot is still really bright.