-When the damper (damping hinge) falls
loose during delivery
Please search for the damper (damping
hinge), a “gray plastic pin” in the product box or
between the product packaging.

-If you have the smoother (damping
hinge), the “gray plastic piece” please install as below

1.
Look at the back groove of the cover
2.
Locate the knuckle of the damper
3.
Insert the gray plastic pin into the damper knuckle
4. Turn the damper 90 degrees