I believe that Fritz15 did the machining and Herculaneum79 was the front man. He used to post here but I haven't seen a post from him in some time. (You can search "mini copper worm" to find the original thread.) I don't understand German so I've never even looked at the German flashlight site.
A little off topic, but I met Herculaneum79 - he was visiting friends near me and I met him at the local train station. Took delivery of my mini worm and we showed each other lights. He had a Lux-RC Lab light and it the first time I'd seen one. Very cool. A nice guy and it is too bad he doesn't post on CPF anymore.