As i was searching some stuff today, i found a car cigarette lighter recharge cable...A really cheap one for sale for +- 1 euro at dump stores.

Anyway..it was perfect to make into a ledpen, and i used the available mechanism as pushbutton for the led, so in this version..clicking is pushing the pen softly on the surface.

http://www.youtube.com/watch?v=WwIcy4fwzS0







In the last picture the pen with battery and led in place and ready to go.

here some more pictures, now with a button as well.

tnx..it was really easy to build as it was a perfect fit from the start
also, the spot where those metal bending pieces where, now form a perfect sized hole for those very small square buttons you find in radios and stuff. like 4mm2 or so, so the same plug could be used for pens with a button without it becomming ugly as well.
Check this photo..it fits perfectly (allthough atm 2 connections prefent me from fully placing it, but the dimentions are a perfect fit, it even has the same depth as the hole.)

edit.. so i made it and this is how it looks now (as cn be seen in the first post)


also check this perfect fit for the led.


It works pretty good as well with this alternative button,..although it does limit its use to hard surfaces, but at it, it probably works better. It also feels good in the hand (although 1cm more wouldnt have been bad)

The car cigarette plug is a One standard plug (or at least i think it is).. meaning that everyone should get the same perfect fits as i did.

I just noticed that pressing vs clicking makes a huge difference in reflection.

pressing:


clicking:(with the led on the paper, but witthout applying pressure)

Good idea! And well documented!!!
Thanks