The current design Dresser-Rand has for their power coupling relies on a heavy interference fit to attach the shaft and the coupling, which requires high pressures used to expand the hub resulting in a deflection that ultimately causes the edges to dig into the shaft. This creates scuff marks along the axis of the shaft and creates a visual marker which most customers perceive as damage. Over time the scuff marks can create stress risers and the fatigue life decreases. The current proposed solution modifies the geometry of the existing design to prevent the coupling from digging into the shaft and to also reduce the pressure required to expand the coupling. The lower stresses induced by a lower pressure could lead to a small enough deflection of the edge as the avoid making geometry changes at the lip of the coupling. An analysis using CAD/FEA software could yield a model who`s parameters can be altered to achieve the desired solution. This model will then be made into a prototype which will then undergo testing to verify that the desired results have been achieved.