A ship engine failed, no one could fix it.
Then they brought in a man with 40 yrs. on the job. He inspected the engine carefully, top to bottom.
After looking things over, the guy reached into his bag and pulled out a small hammer. He gently tapped something. Instantly, the engine lurched into life.
The engine was fixed!
7 Days later the owners got his bill for 10k.
'What?!' the owners said 'You hardly did anything. Send us an itemised bill. ”
the reply simply said Tapping with a hammer. £2 Knowing where to tap? £9,998
Don't Ever Underestimate Experience.