Thanks for finding that bapgood! I envisioned the exact same modification, but seeing it in detail is very helpful! Although, I don't see how that would help improve the voltage drop, other than sanding the contact points. I have done that, and applied a very small amount of no-ox-id to all the contact points which has made some improvement. The only thing I haven't tried or even considered, was soldering the spring to the battery pin. I'm interested in the difference that would make to voltage drop, as I assumed the biggest problem with the switch design was the use of the spring to complete the circuit. The possibility of the spring eventually becoming deformed enough to remain in constant contact even when the switch is not in use has me wary of using the device until an entirely new spring-less modification arises. I'm using a short stop fuse with the #20 at all times because of this frightening scenario. I do have the V2 with copper pins and spring, BTW. Is this what a stainless steel body does to voltage drop? I have nothing to compare it to other than my all copper mod, which is not a fair comparison to make.
FYI in case this wasn't mentioned before, the #20 can be made non-telescopic by reversing the direction of the inner battery tube. That's for 18650's only, but eliminating the telescopic tube wobble has made the #20 far more appealing to me, personally.
