Originally Posted by Curmudgeon
The snap shackle is a terrible design for a tether. You should get the double tethers (with attachments at 3ft and 6ft) with all carabiner hooks. And carry a knife.
I know that releasable shackles have their strengths.
Ask a rock climber to hang from a cliff with one and he'll tell you to get stuffed. Then think about hanging from the mast head
, yourself, on a breezy day from a spin shackle - no one suggests that, though.