710 engine part?

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

>>blonde came in and asked for a seven-hundred-ten. We all looked at each other

>>and another customer asked, "What 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 mechanic 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

>>710 on this car?" She pointed and said, "Of course, its right there." If

>>you're not sure what a 710 is Click Here:

http://www.hotautoweb.com/cogifs/710.jpg

I thought someone might crack a smile on this one.  

Hydrilla