Explain the 'Multi-Turn' concept in spiral rings and its impact on 'Radial Wall' thickness requirements.

A multi-turn spiral ring (usually 2 or 3 turns) is coiled from a thinner flat wire than a single-turn ring of the same load capacity. The total thickness $T_{total} = n imes t_{layer}$. The 'Multi-Turn' design allows for a smaller radial wall ($b$) because the load is distributed across multiple layers. This is critical in applications with 'Thin-Wall' housings where a deep groove for a thick single-turn ring would compromise the housing's structural integrity. Additionally, the multi-turn design provides a full 360-degree 'shoulder' without the gap found in standard circlips, ensuring uniform support for the retained part and eliminating 'point loading' on the groove.