A couple of comments:
1. Anyone who relies upon friction, etc, to keep their anchor shackle in place is, well, bloody foolish. it takes but moments to mouse it, and a few cents worth of wire. This is a no-brainer if ever there was one!
2. Stainless vs monel wire... We've used aircraft 304 stainless seizing wire for many years for the mousing. We've never seen any signs of corrosion
in the wire, and we've spent thousands of days/nights at anchor. We have had mousing get ripped physically from the shackle, likely due to encounters with debris, rocks, coral
, whatever, but suspect that monel wire would have suffered the same fate.
One fault with this wire is its small diameter (.030"). I believe that its main use in aircraft is safety wiring
screws, and the small diameter is needed in this application. for mousing the anchor shackle a somewhat larger wire might resist physical trauma better. When our one pound can of wire finally runs out in the distant future, i'll likely get heavier wire if I can!