One tool every gearhead should have and why

My two post hoist. At my age and physical limitations, there is NO WAY I could pull off any of the stuff I do. It "leads" to other tools, like the home made transmission jack

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The trans jack, so redneck, so ugly, but yet so incredibly useful...

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Pulling the engine out of the "Mini (white) Whale"

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I like how you put the jack on rails. Clever!