Adapter Topeak MTX-Rack to Hodgson Bike Light

I like the bike backlight from Hedgson very much, it's bright, robust and USB-chargeable. But the holder for the seat post is fixed to it with an rubber band and not very trusty. It bugs me I have to put the lighting tube backwords into the holder, turn it around and then snap it into a fixing machanism... too complicated.

I needed a backlight for my MTX-rack so I designed an adapter to get the Hedgson light mounted to it. Nevertheless a better snapping mechanism should make handling easier.