Official Answer
Answer
The 'Mandrel and Sleeve' method is the industry standard for preventing over-stressing of the ring during assembly. A tapered mandrel is placed over the end of the shaft, and a sleeve pushes the ring up the taper until it snaps into the groove. The taper angle should ideally be less than $10^{\circ}$ to minimize the radial force required. This method ensures that the ring is expanded uniformly. If pliers are used instead, the stress is concentrated $180^{\circ}$ from the opening, often exceeding the yield point and resulting in a 'loose' ring that lacks sufficient 'cling' on the groove bottom.
