1. Correction Tape: The gears are all interconnected, and so the correction tape works well, without jams etc. However, if 1 gear was taken off, it would cause the correction tape to fail.
2. Nail clipper: The lever functions in a way that makes it easy to clip the nails. This makes use of having to apply lesser effort to clip the nails.
3. Nut cracker: The nut cracker works to crack melon seeds (gua zi). This is also using lesser effort to break a larger load. However, it is not sturdy and the seed often falls off.