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MacBook (13-inch) Additional Procedures — Mitsumi Keycaps — 307
3. Note the stabilizer bar and clips on the underside of the keycap, and check that the dual-hinge
mechanism lays at.
4. Test the operation of the dual-hinge mechanism by using a black stick to carefully raise and
lower the mechanism.
If it is installed correctly, the hinged pieces should move smoothly.
If it is damaged or loose, refer to the section “Reassembling the Hinge Mechanism.”