Customizeable bike light mount (rear)

This is a costumizeable bike light holder inspired by the [31.6mm bike light holder](http://www.thingiverse.com/thing:1487051). My seat tube is too thin, so I redesigned it in OpenScad and made it costumizeable.

You need:
* 2 M3 nuts
* 2 screws, ~16-20mm lenght
* aluminum LED bike light

These aluminum LED bike lights are very wide spread and very cheap. Just search on ebay or aliexpress. They are powered by 2x CR2032 batteries lasting for quite a while if you use them in flashing mode.