Official Answer
Answer
For internal rings in blind holes, removal can be difficult. Spiral rings are often designed with a 'Removal Notch' or a 'Scalloped End' on the ID. This notch allows a screwdriver or a dental-style pick to get behind the ring and 'unwind' it from the groove. In high-vibration environments, the orientation of this notch is important; it should be positioned away from the primary vibration axis to prevent the pick-point from becoming a fatigue initiation site. For military or aerospace applications, the removal notch geometry is strictly controlled by standards like MIL-DTL-27426 to ensure consistent field serviceability.
