According to Charlie Wine :
785 may be a grappling hook for logs, but I respectfully suggest it isn't
for use in inaccessible places... Suppose you drop it down a well, or into a
river or lake, and it grabs something you can't lift... then what?

That might be a use for the notches which I commented on. One
rope to pull up the weight, and then another to pull up on both notches
to open the jaws so you can pull it up.

Enjoy,
DoN.

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