a device and approach to ensure acceptable alignment of internal mechanical components requiring bushings . over wide ranges of temperature , some bushings experience sufficient thermal dimensional change as to misalign or to interfere with other mechanical components . such bushings may be reduced in size or include a plurality of outer surfaces to avoid interference , and employ ball nose assemblies to maintain acceptable alignment . at full thermal expansion of such a bushing , the ball nose assembly inter - relates with the bushing so as to maintain alignment without interference .