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This solution works for all three of these puzzles . . . and probably several more different-shaped nail types .

       

Here is the starting position

    right-hand latch starts its way downwards

    . . . . . and over . . . . .

   

. . . . . and over . . . . . until you have made an approximate total swing of 315°

At this point, as you want to continue the swing, you will automatically
be forced to twist the right-hand latch away from you . . . . . to be finally separated !