How is humour employed to comment on the pains that the author took to get his watch set right?

While narrating the story of how the author's watch was repaired by seven different people and still did not get repaired, the author uses humour to grab the attention of the readers and to keep them entertained. It is funny to see how all them try to repair the watches, but are unable to do so which makes them the 'Jack' of all trades, but a master of none. In their tries of repairing the watch, it was just spoilt more and more and the author understood what his Uncle Williams said about tinkers when he said that 'a good horse was a good horse until it had run away once'. The author also tries to relate his situation to that of a mummy in a museum when the watch was moving slow and was behind time.
The subtle humour employed to comment on the pains that the author took to get his watch set right keeps the story light, enjoyable and entertaining for the readers.