andy pugh wrote: > On 13 May 2012 22:43, charles green <xxzzb...@yahoo.com> wrote: > > >> has anyone ever heard of a ball worm? >> > > I have seen one developed by a college urology department, which is > slightly scary. > Yes, before rack and pinion steering, cars used Armstrong steering gear, which was a form of a ball worm, only the worm wheel was only a sector. There was a shell around the worm that acted as a track to circulate the balls around the worm.
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