I have the general theory down. The parts switch, battery holder, 510 connector but I have a question. What supports the 501 battery connector. There seems to be no lock ring to tighten it down even if I make a tight hole I would think it will become loose after a short amount of time. Here is one style I am looking at. but even the non wired ones have to means of support , no lip etc. thanks
Prewired 510 Battery Connector, Sealed
Prewired 510 Battery Connector, Sealed