W4-Components and threads
I had a hard time coming up with an exciting form for a 2x2x2 connector piece. I extruded from a circle and started adding on top of it. The final product is somewhat like the ironman radio reactor but with a tub sticking out to be threaded and connected with other pieces.
For the McMaster-Carr piece, I picked the following two parts. I extruded a tube from the rotary shaft first. However, I had a hard time finding the right thread, even I know the number base on the website's technical sheet. There are too many options in the dropdown menu, but I don't know how to navigate the category I need. I made another rod on the tub to connect the Ball Joint Rod End. To make the middle connection smoother, I made a sand glass shape in the middle and cut flat on the Ball Joint Rod End side, so no parts are sticking out.
Idler Rotary Shaft
Find it on McMaster-Carr here
Ball Joint Rod End, 10-32 Thread
Find it on McMaster-Carr here