Ball bearing

Ball bearings were hard and silver. (PROSE: 64 Carlysle Street ^[+]Loading...["64 Carlysle Street (short story)"]) Fitz Kreiner once used ball bearings in his musical improvisation, running them up and down his Telecaster electric guitar. (PROSE: The Slow Empire ^[+]Loading...["The Slow Empire (novel)"]) Heavy rain could be compared to the "clattering down" of ball bearings. (PROSE: How You Get There ^[+]Loading...["How You Get There (short story)"])

At Hellcombe Factory the Eleventh Doctor used ball-bearings to locate where the magnetic field came from. They stuck to the duplicate of Ralph Hellcombe. (COMIC: The Dalek Project ^[+]Loading...["The Dalek Project (comic story)"])

There existed a type of sweet known as edible ball bearings, typically used for cake decoration, which looked like small silver balls. (TV: Fear Her ^[+]Loading...["Fear Her (TV story)"])

Behind the scenes

In the short 1978 sketch Merry Christmas Doctor Who, K9 Mark II tells the Fourth Doctor and Romana I that he wants "enough ball bearing to last out the series" for Christmas.