You can see that there is an inner triangular screw at the bottom. You need such a special screwdriver. Generally, a full set of screwdrivers bought online costs twenty or thirty yuan.

Turn the inner shell to the right according to the figure below and break it hard. You can also break it hard without rotating, which will slightly damage the buckle, but it will not cause the buckle damage.

After the break.

Wipe dry after cleaning, and don't touch electrical parts with water.

Install the handle wire _ OK. Gap alignment. When the two buckles are aligned, they can be installed.