One day, an auto parts sales clerk was was aproached by a woman who looks very weary and troubled. She said she had a car who lost an engine part and she needs a new one for a replacement.
The store clerk asks "What part do you need?, The woman replied "I need a seven-hundred-ten."
The store clerk confused asks "What on earth is a seven-hundred-ten?"
She replied, "You know, the little piece in the middle of the engine, I have lost it and need a new one."
She replied that she did not know exactly what it was, but this piece had always been there.
The clerk gave her a piece of paper and a pen and asked her to draw what the piece looked like.
She drew a circle and in the middle of it wrote 710. The clerk then took the woman over to another car which had its hood up and asked "is there a 710 on this car?"
She proudly pointed at it and said, "Of course, its right there."