I also made up both torque tube mechanisms. First you add the ends, then you install one end of the unpainted tube. You attach the other end to the middle tube and adjust it to the correct length
The last two pictures show the fitting of the last piece of the assembly in place. In picture number four you can see that one of the brackets lies flat against the table while the other bracket is raised a fixed amount from the table to the bolt that runs through it. I cut a piece of plywood to the correct height and supported that end while drilling.
