To give the answer credit, that answer does suggest adding the vectors (the same). It is also much more thorough than what I said, and I like the images. I like the answer and I was attempting to iterate.

I think these two things could be improved from that answer:

* I'm suggesting a general approach to measuring track tension, which is the average of the vectors. I didn't see that idea in the answer.

* I think the answer could be communicated a little more simply. For example, we don't need to think in terms of Q[sqrt(3)]; I see that as a distraction.