Got another request from a Trek Madone 9 owner. Wanted to mount a Cyclic Fly6 on the back using that little bracket so I have been working on this design. Works the same way as the Garmin mount, you must disassemble the reflector bracket and pull it apart then insert this and put the bolt back in while adding an M4 nut on the front side.

Trek Madone 9 Cyclic Fly6 Insert