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An axial torque coupling between a pair of adjacent rotating machine wheels comprising a first wheel having a first plurality of axially extending knuckles, the first plurality of knuckles spaced circumferentially in an annular array with first slots therebetween, and a second wheel having a second

An axial torque coupling between a pair of adjacent rotating machine wheels comprising a first wheel having a first plurality of axially extending knuckles, the first plurality of knuckles spaced circumferentially in an annular array with first slots therebetween, and a second wheel having a second plurality of axially extending knuckles, the second plurality of knuckles spaced circumferentially in an annular array with second slots therebetween; and wherein the first plurality of knuckles are received in the second slots and the second plurality of knuckles are received in the first slots, each of the first plurality of knuckles engaging an adjacent one of the second plurality of knuckles only on a single radial surface.

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An axial torque coupling between a pair of adjacent rotating machine wheels comprising a first wheel having a first plurality of axially extending knuckles, the first plurality of knuckles spaced circumferentially in an annular array with first slots therebetween, and a second wheel having a second

An axial torque coupling between a pair of adjacent rotating machine wheels comprising a first wheel having a first plurality of axially extending knuckles, the first plurality of knuckles spaced circumferentially in an annular array with first slots therebetween, and a second wheel having a second plurality of axially extending knuckles, the second plurality of knuckles spaced circumferentially in an annular array with second slots therebetween; and wherein the first plurality of knuckles are received in the second slots and the second plurality of knuckles are received in the first slots, each of the first plurality of knuckles engaging an adjacent one of the second plurality of knuckles only on a single radial surface. of positioning including the steps of providing an actuator system that moves the ball bearings, providing a feedback control system comprising a sensor having as a sensor output an indication of a position of the cylindrical article, and a controller having the sensor output as an input and a command signal to the actuator system as an output, and using the actuator system to move the ball bearings responsive to the feedback control system until a desired position of the cylindrical article is achieved. 16. The method of claim 15, wherein the step of providing a cylindrical article includes the step of providing a component of an optical system as the cylindrical article. 17. The method of claim 15, wherein the step of positioning includes the step of applying a biasing force to the cylindrical article in a