For the FL all I bought was the 510 battery connector and flashlights.
I had a flashlight (purchased for a 1.00) from the dollar store.
The switch is the one that comes with Mad Vapes flashlight. I modded the on/off to a momentary. There is great instruction/photos in the modders forum which I followed really easy!
See this post here for additional info- since someone else wanted to know more
http://www.e-cigarette-forum.com/forum/madvapes/66185-mod-18650-a.html
I will try to help ya (too funny)