OK mark me as a skeptic. I watched all three videos, never once did he explain how the balancer would work on blades that have the oval hole. Also he did not explain how you would go about changing the balance on a blade that is out of balance.
I don't doubt that the balancer is accurate, but comparing it to the nail in the wall is absurd. And how much time do you want to spend to get the blade precisely balanced? Do you grind off metal on the heavy end or weld metal on to the light end, and how much metal to subtract or add ?
Grind, balance, grind, balance, could go on for an hour.
Richard