What are the 'Multiple Turn' benefits for retaining rings in shock-load applications?

Multi-turn spiral rings (typically 2-turn or 3-turn) provide a $360^{\circ}$ retaining surface with no gap. In applications like jackhammers or heavy-duty drivetrain components, shock loads can cause a single-turn ring with a gap to 'clasp' or vibrate out of the groove. The multi-turn design provides a much higher 'Stiffness Ratio' and ensures that there is always material in the groove, regardless of the ring's orientation. The load is distributed over multiple layers, which significantly increases the total shear area and the ring's resistance to 'dishing'.