20 Second Light Timer

When my sister was a little kid, she was scared of vampires. Her nightly routine consisted of pushing the bi-fold closet doors all the way open so no one could hide behind them, hopping into bed and pulling the covers up so they wrapped tightly around her neck, and then she'd stare intently into the closet to make sure no one had snuck in there while she was fussing with the covers. And then she'd beg for one of us to turn out the light. This took about 20 seconds.So if you or someone you know is scared of vampires, or maybe you just need some time to get across the room, this thing's for you. It uses a steel ball that rolls back & forth down a track and then falls in a scoop attached to the light switch lever, turning it off.Oh, and it's also got a bit of interesting physics in getting a ball to roll really slowly.Watch it go at: Requires a 5/8" diameter steel ball and three 6-32 screws.ASSEMBLYTo complete the assembly, you will need:1 5/8" diameter steel ball3 6-32 x 3/8" long socket