A ship engine had broken down and no one could fix it.
They called in one expert after another, but none of them could figure out how to fix the engine. So they finally brought in an old man who had been fixing ship engines since he was a youngster.
The old workman inspected the engine very carefully and very patiently from top to bottom while the anxious owner waited impatiently urging him to find a solution as quickly as possible.
Finally, after looking things over for a few minutes, the old man reached into his bag and pulled out a small hammer. He gently tapped something and, lo and behold, the engine instantly lurched into life. The problem was fixed!
The workman carefully put his hammer away, shook hands with the jubilant owner and left.
A week later, the owner received a bill from the old man for £10,000.
‘What?!’ the owner told his secretary, ‘Ten thousand pounds?! He hardly did anything! Ask him to send us an itemised bill.”
And a couple of days later, the new bill arrived in the post.
It simply read:
Tapping with a hammer: £2
Knowing where to tap: £9,998
The moral of the story:
Never underestimate the value of experience and know-how! :-)