I hope you won't mind me saying..... I may be wrong, but I think it's the "correct way" for the Uj's on the shaft to be 'in-phase' ie, lined up so they are a mirror image so that when the shaft turns it effectively stays the same length if that makes sense. If out of phase the shaft won't stay straight as it revolves? Obviously more important for a fast-moving item such as a prop shaft, but still probably improves things even for a steering column?
|