I actually am quite familiar with wires - In my line of work, I encounter them quite often in all sorts of thicknesses, lengths and colours.
In actual fact, I mentioned them in my last post - I asked how you hid them, since my initial assumption was that you hid the 9v battery in your helmet and ran the wires to the LED from there.
This would necessitate a hollow rangefinder stalk, and I've yet to see one of those rigged up to carry a wire up to the rangefinder itself and still be able to freely rotate.
Which helmet ARE you using, then? Since I don't think that the Don Post / Rubies would have enough room inside to even store the battery!
Are you one of the lucky few who managed to get hold of a MSH? Or a Marrow Sun?
It must have taken quite a bit of work to install the mechanism you describe - Why did you decide to go for a 9v battery, instead of the more-commonly-utilised button-cells?
Battery life, or was it simply a brightness issue?
Also, how are your two LEDs wired up? In series or in parallel?