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All the commercial rigs have a safety device that must be released to allow the load to lower (either a pawl on the crank used to pull the rope or a clamp that grips the rope itself). Probably something about lawyers, liability insurance, crushed skulls, etc. You'd think common sense would be enough ("don't let go of the rope or something bad will happen")
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"Freedom begins when you tell Mrs. Grundy to go fly a kite." - R. Heinlein
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