I just made 2 of these copper mods yesterday. So far they are just a functioning first draft, as I'm waiting on parts. Right now its just mechanical, but once I get the parts I will be wiring a switch. I'm not interested in the mechanical pressure switch.
My initial thoughts? I LOVE this mod. Right now I am using a short 6V 2CR5 Li-Ion battery with a spacer and it is just great. I am waiting on the 14500's from rtdvapor.com