Bike Seat Rail Mount - Topeak F25

The Topeak F25 seat rail clamp does a great job of mounting a pack to the bottom of your bike seat. However, I wanted to mount other things (batteries, lights, etc.) to my seat, and used this clamp as a platform upon which I could design other mounts. It locks directly onto the Topeak F25 rail clamp and unlocks easily with the tab.
This model is designed to match the Topeak F25 (http://www.amazon.com/Topeak-F25-Wedge-Pack-Fixer/dp/B005DTILE0).
OpenSCad and stl files are both supplied. Commen