Bike mount for 24mm Flashlight aka Blf A6/ Astrolux S1

This is a bike mount for the Blf a6/ Astrolux s1 (http://www.banggood.com/BLF-A6-XPL-1600LM-7-4modes-EDC-LED-Flashlight-p-991823.html?rmmds=detail-left-hotproducts) flashlight my dad got from banggood.com. He wanted a cheap solution for an awesome bright light, and i think this really serves the purpose well.
It should fit most bikes with a handle diameter of 22-23mm (~9/10 inch) with an 24mm o-ring as a rubber band. if you use a smaller o-ring, it might fit smaller handles, but i found this s