MacBook (13-inch) Additional Procedures — Mitsumi Keycaps — 308
5. Check that the stabilizer bar can pivot easily within the hooked ends of the keycap.
If any of the hooks or clips are bent, broken, or missing, replace the keycap.
If the hooks and clips are intact, re-use the keycap.
6. Check the rubber dome inside the keycap opening on the top case.
When the rubber dome is pressed and released, it should spring back upright.
If the rubber dome is o center or damaged, replace the top case.