If you are ONLY touching the powder coating, and the touch sensor, and it goes off, you must have a lot of moisture in your hands. Trust me, it doesn't do that for me. If yours does do that, than it acts likes the Shiny version of the Saber.
And I really do wish it was that simple... to use some pipe and through on some "hose caps". When I was looking for brass caps to use, I got in touch with a large metal milling company with my threading specs. They sent me some examples of what they could supply for me. I can't help what other companies use the same caps for. Then they are polished and welded with the 510 connectors, and sealed and tested for continuity. I wanted brass because of the electrical qualities.
I know one thing, we are one of the very few companies that don't use any stock switches, "pipe", or all internal parts. Everything is constructed and assembled in my shop. People don't understand that all
mods made out there use readily available parts, including their pipe stock, or switches, or to say the least... battery boxes!