The hole and the pin shift gradually when the PF belt is put more than the tension value that doesn't slip. The hole is damaged, and the belt breaks at the end.
The mechanism of sending the steel belt is complicated, and does not work only by power to hang. The frictional force is transmitted in the receiving power on the curvature sides except the pin.
The pin-feed hole is open at the center or both ends excluding example 5 (please refer to steel belt 25). The pin is installed in outer of the belt pulley. The pin of the belt pulley is hung on the hole of the belt. This is sprocket pulley. The steel belt is wrapped around sprocket pulley. The steel belt is transported while being continuously inserted the pin with the rotation of the belt pulley.