OK, I have been looking at these on line, and I think I understand the yellow part.
In the pic that shows the assembly of those 3 parts, what you are calling the threaded rod, looks more like a mettle cable that would be the motion transfer component, and would slide inside the yellow part, making the red tube redundant.
I now see that, what looks like a mettle cable, is the threaded rod, end extension, that mates up to the yellow sliding component, and attaches to the clevis.
Is this correct?
Does the threaded rod actually thread into the yellow tube, or is it forced in, leaving the yellow tube to deform around it?
Do you glue it in as wel?