How should 'Removal Notches' be utilized in the design of a spiral retaining ring for field serviceability?

Spiral rings are removed by prying one end out of the groove and 'unwinding' the ring. To facilitate this, a 'removal notch' (a small scalloped area) is often designed into one of the ends. This allows a screwdriver or dental pick to get behind the material. In high-vibration aerospace systems, the orientation of this notch can be critical; it should be positioned away from the primary direction of centrifugal force or fluid flow to prevent accidental catching. For heavy-duty rings, a 'double-offset' end may be used to provide a larger gap for the tool. Proper removal notch design ensures that the ring and the groove are not damaged during maintenance, allowing for the potential reuse of the assembly.