The hole is specifically for that wire.
As a guy wire works the shackle against the eyebolt, every sway of the mast or guy wire back-and-forth puts a tiny twist on the shackle bolt. They don't quite cancel out. This is why the shackle bolts unscrew, even if you tightened 'em up solidly, and why a mousing wire is necessary. (Works the same way on an anchor or rigging, too.)[ Parent ]
Whipping twine doesn't corrode, or catch unwary fingers and dissimilar metals are to be avoided in the marine environment. SS wire is only used on SS shackles. I would never use galvanised wire for mousing a shackle on a boat.
Owen If you're not living on the edge, you're taking up too much space.[ Parent ]
