39. Eureka!

One of many eureka moments came one day when Ram Chandra Sharma had a flat tyre while riding his bicycle. According to Chandra, he went to a roadside stall whose owner happened to be retreading a tyre with vulcanised rubber. Once his bicycle was fixed, Chandra rushed to X for consultations on how this method could be used for a particular purpose. Later he returned to the tyre shop, and did something. What came out as a result for which X is attributed to ?