Yep. I learned that I needed an extension the day I started to do mine. I ran down to Sears and picked up a solid one for a rather nice price of $6.

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1999 Mercedes-Benz S600, 103K miles - garage queen
1988 Mercedes-Benz 560SEL, 89K miles - daily driver
2007 Hyundai Sonata Limited, 31K - daily driver