I hate to be a skeptic but Locktite, the shackle pin torqued tightly, the shackle pin threads were peened and a locking wire to boot and the thing still came apart??? Something doesn't sound right. I'm not doubting your story at all but after all of those measures there's no way that shackle pin should've backed out. Heck, the connecting rods in your engine are subjected to thousands of jarring movements every minute and they don't come apart & all that holds them together is a good tightening! I would have to scrutinize the shackle a little closer or perhaps sabotage.
Glad you caught it & saved your anchor & better yet, I'm glad you caught it before it parted while still anchored!
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-Shawn-
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