OK I'll admit this one is a tricky build. It is all in the alignment and requires quite a bit of patience to get it right. Yes mine is not perfect... Yet!!!
Needs more work on the alignment of the balls!
Step 1: Materials
You will need 5 glass marbles about 1 inch in diameter.
1/8 inch brass welding rod.
A couple of batteries.
You may also want to reference my knife switch instructable. A simple slider will ruin the effect!
Other materials will be presented as the build unfolds...