blondes and cars

Blonde walks into a local garage, goes up to the mechanic and says "I'm looking for a seven-hundred-ten."

Everyone in garage looks around puzzedly, finally the mechanic says "er, whats a seven-hundred-ten?"

she replies, "you know, the little piece in the middle of the engine, i've lost it and need a new one, i dont know exactly what it is, but i know it has always been there and now it is missing."

so the mechanic hands her paper and pencil, kindly asks her to draw what the piece looked like.

she takes the paper, draws a circle and in the middle wrote 710.

confused and frustrated, the mechanic walks over to another car and says, is there a 710 on this car?

she pointed and said "of course, it's right there.

here is what she pointed to
http://rtccom.net/~mfjgolf/710.jpg