When I bought the Ford balancer it came with a small weight welded to the inside of the pulley. Most likely the balancer was zero balanced and to get the stamped steel pulley balanced it needed a weight. The original balancer and pulley that came on the car had no weights on the pulley, either the pulley was perfect or they balanced the whole thing with the pins.
You would hate to break a crank with an improper setup though. I am running some Match underdrives and used the new crank pulley on my replacement Ford balancer. I don't know if it's right though.
Jerry