Step 66: Handle/Electronics: Mechanicals 1.
The idea here is glue the rod into the center of the flashlight, so it comes out the left side. It does not need to spin- quite the opposite. Once you have your assembly ready, push it into the flashlight and fix it in place with a lot of hot glue. Don't be shy with it. I happened to have some nice black plastic that sealed the end, but you could use another washer or nothing at all.