How do you ensure the 'Removal Notch' orientation does not interfere with the system's balance?

In high-speed rotating equipment, the asymmetry of a spiral retaining ring (due to the ends and the removal notch) can cause dynamic unbalance. While spiral rings are more balanced than stamped rings with lugs, they are not perfectly symmetrical. To mitigate this, engineers can use 'Symmetric' or 'Balanced' rings which have material removed or added at specific locations. For standard rings, the orientation of the removal notch should be specified on the assembly drawing (e.g., 'orient notch $180^\circ$ from the keyway'). In critical cases, two rings can be used with their ends offset by $180^\circ$ to cancel out the unbalance mass.