Brion recommends a bit of welding rod bent to cover the holes in each stud. For open body turnbuckles the right sized split rings can be nice if large enough to go around one side of the body and through the hole in the stud.
I like regular cotter pins exactly sized so that the loupe part is what stops the screw from turning, the shorter leg just gets out of the hole and left straight does not clear the turnbuckle body, and the longer leg can be cleanly bent out of the way. That will be undoable when needed and won't need boots or tape or such.
G'luck
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