Here is a copy (sort of) of CRX’s tiny brass flashlight. Mine is 8.8 mm diameter by 16.5 mm long. I used CRX help when it came to ‘how the heck do you wire this up’. And I included a sketch of how I wired up this one. I also used help from Here . Again for help in wiring it up. I saw CRX’s little light from 2017 and just had to try to make one of my own. It is really only a conversation starter. It is powered by three button batteries (#377). Friction between the inner and outer tube keeps the light on when you push it together. You simply pull it ‘apart’ to turn in off.
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Thank you folks for the comments! And I am still polishing. And I think CRX took a photo of his tiny light resting inside a 10180 light. CRX - What size are your images when you put them three across?