A bike light mount designed for the Cateye TL-LD130 / TL-LD150 and similar Cateye lights.
A 6-32 screw and nut works well to secure it.
It's a friction fit with the bike light, if your tolerances don't provide a tight fit, then scale the appropriate axis a very small amount. This shouldn't affect post mount.
The author remixed this model.
Changed seat post diameter compatibility to 27.2mm