What was Uncle Williams' comment on the 'tinkerers' of the world?

Uncle William is not a character in the story; however, the author gives a glimpse of him. When the author gave the watch for mending the last time, he reckoned that it was costing him more than the original cost. All the attempts so far have been futile and the verdict of the last watch maker made him remember what uncle William used to say that a good horse was a good horse until it had run away once, and that a good watch was a good watch until the repairers got a chance at it. The author perceived what his uncle had known with all his knowledge and experience. All the unsuccessful tinkers in the world are not specialists. They are the 'Jacks' of all trades and masters of none. Uncle William used to wonder what became of all those gunsmiths, shoe-makers, engineers and blacksmiths who never could be successful in their work sphere. It is important to acquire specialisation at least in one particular field, else one is left being a tinker, an apprentice, and not a specialist.