So far as I can see, the answer is, either find a snazzy way to tape it to your bike without blocking the LEDs, or maybe get some tough rubber bands and put them around the seat post and try and strap the light on that way. Failing all other creative ways of lashing the lamp to your bike (which may not be too handy if you want to re-charge it regularly !), then I'm afraid you may have to place it on a shelf and gaze wistfully at it, or just throw the thing away.
The rubber strap on mine broke very quickly, so I am deeply not impressed with this feature of an otherwise nice little lamp.
4 years, 6 months ago