Bill Holtz is an engineer for Rexnord Industries, 5555 S Moorland Rd., New Berlin, WI 53151, 262-796-4069. The following people contributed technical expertise and content for this article: Donald W. Hindman, Manager, Engineering, Rexnord Coupling Group; Tom Harris, Application Engineer, Rexnord Coupling Group; Carl Leichtenberger, Application Engineer, Rexnord Coupling Group and Greg Leofsky, Application Engineer, Rexnord Coupling Group.