Have you actually watched video of quickjack being tested.. its not made by fly-by-night company, there real engineering into it, testing, etc.
Much like its vertical lift twins, there is mechanical lock as it goes up, unless you bypass the lock, it will not go back down.
QuickJack IMHO is safer than Projack which has no safety UNTIL it at its highest lift point.. yeah.
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ing for grip.
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