Repluggers

When your thong (foot thong!) pulls through and the rubber is somewhat worn and happens again and again. Rather than buying a new set of thongs you buy the replugger which clamps onto the bit that goes between your toes, pushes through the gap and then uses a folding split-pin mechanism to fold out to keep it in place. If it’s small enough the whole mechanism can fit inside of the little hole that it goes through.