A blonde came into a gas station and asked for a 710 thing.

The mechanic asked
"What is a 710 thing?"

"That thing that sits in the middle of the engine....I must have lost it."

"What does it do?"
he asked her.

"I don't know....but it was always there!"
she answered.

The mechanic gave her a piece of paper and a pen and asked her to draw it.

The blonde made a circle with the 710 in the middle of it.

The photo below indicates what she wanted.