wrote:

I don't get the why if this is what you mean by beam scale
torque wrench.

I show both types of torque wrenches in my original post, reproduced below.
http://wetakepic.com/images/2018/02/17/torquewrench.jpg

The "beam style" (with the black handle & red pointer) has a "pivot pin" to
ensure that your force is applied at a single point of contact on the bar.