This thread will probably get moved to the mods section,but here goes...
First unscrew the cover.
then if you look down into the head end there are 4 tabs the hold the head on .These tabs are located on each side of the 2 battery springs.The flashlight is snapped together by these tabs engaging slots in the body of the flashlight.
You have to use 2 tiny screwdrivers to pry the tabs on one side of the light while carefully rocking the battery end back and forth and pulling on it.
This is a little tricky but be patient and it will come apart.
Be warned..the circuit board traces are very delicate and will stand only a couple or solderings before the traces come right off!!
To get the reflector off,you have to carefully melt the ends that hold it on the board.
I have not tried overdriving it as it seems the LED in there is driven pretty hard as it is.
I tried it with a red led (ran too hot )
A blue one worked fine .
An amber one was overdriven to the point of being orange and then fried );
there is a schematic kicking around on the web somewhere for this light.
Have fun
