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As one who also did quite a bit of mountaineering and rescue, bosun chairs also give me the 'willies', especially when belayed to a 'winch'. After the last time I went 'up', I subsequently raised and strained-up the mainsail halyard .... only to have the drum of the winch come off the spindle (old Barlow). I've been 'on-scene' one time when the snap-shackle loosened when this person was working at the mast top, fell to the deck (stancheon, actually). What a mess of a human body.
I still use 'prussik - safety jumpers' across all my terminal knots (never use shackles); and in future, if there is a winch involved - a secondary belay from a spare halyard.
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