The blue part is just a bent aluminum sheet metal bracket (1/8 in thick). It bolts to the TB mini through the top two holes that secure the mounting plate to the plastic housing. Then it is secured to the top of the robot frame via four 10-32 screws and rivet nuts (McMaster
93483A661). The green cylindrical parts are just some stand-offs we made from half inch round stock that we drilled through with a .196" clearance hole. We secure the gearbox to the side of the frame by just running a long 10-32 screw through the TB, the standoffs, and the frame.
Refer to drawings 4293_2014-005 and 4293-2014-018 for the standoff and the bracket.
Edit:
Also, we cut the bottom off of the TB mounting plate for ground clearance. You can just trace the profile of the housing on the plate and then use a band saw to cut it down. Drawing 4293_2014-019 shows all the mods we made to the mounting plate.
