+1, I have a road-found hotshot, and bought that mount for it. My rack only has a vertical tab for mounting lights, so I used just 1 bolt in the center. Also because of limited clearance with my 700x50 tires, I had to mount it upside down. No problem, the light is still very secure (and even a little difficult to get out). Plus the hotshot is unbelievably bright, I can't recommend it enough. Even though I'm a cheapskate, and only have this one because my wife found it on the road, if I lost it, I would buy another.

Also, customer service story, the piece of rubber that is the cover for the two control switches (it is 'the buttons', as you push the switches through the rubber) unaccountably fell out of my light last week! I emailed cygolite asking to buy some replacements, and a preemptive replacement cover for the usb port, and within a few hours they dropped in the mail for me 2 button covers and 1 usb cover -- free! Should arrive today or tomorrow.


Somebody else also recommended Planet Bike Blinky 5, there is at least one packaging of it that includes a rack mount, like this. I have used that in the past, and it is also fine (just not as awesome as the hotshot).