One tool every gearhead should have and why

Unconventional said
^5 Harrison . Ain't retired life grand? Now if I could just get my back to stop screaming at me after 40 yrs on heavy equipment :rofl:

I'm not retired...yet (but close). I love it how every time I work on my cars, especially if I have to crawl under them, it reminds me that I'm not in my teens...rather painfully.