Tires: tires autobalancer, highway speeds, car manufacturer

Question
Hi,
I have a brochure on a tire autobalancer. It's basically about 500grams of fairly fine free-flowing powder that you put inside the 4wd tire. The idea is that as highway speeds, the centrifigual forces move the powder to the right spot on the tire to offset any imbalances.
To quote "as heavy spots pulls tires outwards, the  microbeads move in the opposite direction, creating compensating force".
I am having trouble figuring out in my head how this could work. If the tire had a heavy spot, I would have thought that the powder would move to that spot, not away from it.

Answer
Craig,

You are not alone.  

This stuff has been around for many, many years, and with a few exceptions has not been well received by the industry.  I suspect that means that it doesn't work as well as advertised.

Look at it this way.  Every car manufacturer has an assembly line where tires are mounted and balanced.  They would save a lot of money if they could eliminate the people and the operation of balancing a tire.  But they all still have the operation and there has to be a reason for it.