Instructables Burning Laser Watch : 8 Steps - Instructables
First, use a dremel or a knife to sand down one of the edges of your watch, so your slide switch is sticking out of the edge of the watch for easy access./(you can see in the picture how i did it.) next find a good spot in you watch to house your laser., then drill a small hole for the laser beam to go through. then find a good spot to put the button cell. you might have to use a dremel to make room for all of your components then, if you want, you can glue all of your components so they ...