Those rings (called by some "cotter rings") are prone to having moving lines, like your jib sheets
,snag on their wire ends and strip them out of the clevis. I gave up on using them in places where this was an issue... places like lifeline fittings! It's too bad, because they are often convenient to use in places where you need to remove them frequently.
For me, using conventional cotter pins (split pins to some folks), well bent and then taped over is a more reliable setup.