Managed to do some CAD work on the shoulder rig I'm currently working on.
The holes in the end pieces note go all the way through.
There are 2 models of the handle, two models of T connectors (Model B has issues with mechanical stress, so I introduced model A), two models if the overall assembly and the existing model B of the T connectors leaves more room for the wings of the wing nuts.
Also uploaded new renderings of both variations of the assembly and corrected the bolt sizes in the BOM.
...all before (hotel) breakfast.