How can I wire an LED in the tailcap?

[mikeeey]

I think I have everything figured out, except where to get a right fitting tailcap. These glow in the dark ones are the smaller ones:
http://www.dealextreme.com/details.dx/sku.5714
They work great for fitting over the Aixiz module, but I'm using a MXDL (sku 3405) which uses the larger tailcap. I measured aprox. 20mm, but I cant find any 20mm caps anywhere.



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I wanna put a UV LED in the tailcap of a MXDL, and have a GITD tailcap. If I soldered the LED to the spring I'm only getting a Negative connection, and if I solder the LED to the spring and the host it's still only getting a negative connection. So far I'm not seeing any way to get a positive connection into the tailcap.

However, I will be using 2x cr123a batteries so I will have some room for a wire to travel to the tailcap. This is the only thing I've thought of. I'm not sure what to use to break the connection. I dont want to have a solid wire going to the back. I need something like a JST plug or a dean plug, but small enough to fit in the back of a MXDL tail cap.

Any idea how I can do this? And what are the name of those connector thingys? like the JST plugs.

 

[erdabyz]

Use solid core AWG30 wire. It's about 0.5mm thick with plastic covering, 0,2mm without it.

You can also use coil wire, which is isolated with varnish and is thinner.

For a LED that's more than enough.

However don't forget the resistor if you're using anithing above 4v to fee the UV LED.