I used this.
http://www.dealextreme.com/details.dx/sku.5604

Here's what it looks inside, very simple. You do want to keep a third of the original blinkie board to keep the switch in place.


You will notice I used screws that were too long, but I'm too lazy to change it, and it's already sealed with silicone. The excessive silicone is for the case, which I cracked a little when drilling, so be careful.


My mounting is hacked from a Planet Bike Superflash white case (I used red and black backcase on all of my superflash). I used JB Weld to attach it, as you can see some gray excess residue from the JB Weld. The original mount is identical to the ones on Blackburn Mars 2.0 and host of other lights, and it sucks.