A general method for analysis of the behavior of a flexible frictionless shaft of any arbitrary configuration running inside of a guide tube with negligible clearance and transmitting torque is presented. The method is applied to two configurations: (a) Segment of a plane circular arc. (b) Segment of a helical arc. The first configuration was discussed partially in a Russian publication where the solution for the angular displacement of an unloaded shaft was derived from first principles. The theory also is applied to the analysis of a switching device composed of a Wire-In-Tube with corrections to the solution given there.

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