Seatpost mount for Cateye Reflex light on Giant TCR/Defy aero seatpost

I ride bikes, and am of the opinion that you should _always_ have a blinky taillight for visibility when riding on the road. Only problem is I'm forgetful and often fail to turn on my taillight, which kinda defeats the purpose. Because of this, I love the Cateye Reflex taillight ( (https://smile.amazon.com/gp/product/B003WCFJZE/) ) which turns on automatically when you move the bike. (although you do have to tape over the light sensor which normally makes it blink only at night - but that's very