Blonds and Cars

A few days ago I was having some work done at my local garage.

A blonde came in and asked for a seven hundred and ten.

We all looked at each other and another customer asked, "What is a seven hundred and ten?"

She replied, "You know, the little piece in the middle of the engine, I have lost it and need a new one." She said that she did not know what it was, but this piece had always been there.

He 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.

He then took her over to another car which had its hood up and asked "is there a seven hundred and ten on this engine?"

She pointed and said, "Of course, its right there." And she pointed at this.