Seven-ten

A few days ago I was having some work done at my local garage. A lady came in and said she needed a new seven-ten. We all looked at each other in confusion and another customer asked, "What's a seven-ten?" She replied, "You know, the little part in the middle of the engine, I have lost it and need a new one."

She commented that she did not know exactly what it did, but all cars had them-- and her seven-ten had always been there. The mechanic took her over to another car, pointed under the hood and asked "Where's there a 7-10 on this car?" She pointed and said, "Of course, its right there!"

If you're not sure what a 7-10 is, click this link: 710.jpg