A ship engine failed and no one could fix it.
Then they brought in a man with 40 years. 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!
Seven 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.