Closure to “Discussions of ‘Endurance of Aircraft Gas Turbine Mainshaft Ball Bearings-Analysis Using Improved Fatigue Life Theory: Part 1—Application to a Long-Life Bearing’ and ‘Endurance of Aircraft Gas Turbine Mainshaft Ball Bearings-Analysis Using Improved Fatigue Life Theory: Part 2—Application to a Bearing Operating Under Difficult Lubrication Conditions’” (1990, ASME J. Tribol., 112, pp. 312–314)