A large washer should be fitted between the mirror and the wall (a tap washer is ideal), a nylon sleeve put in the hole in the mirror, and a plastic screw cup placed under the screw head to protect the mirror.
A large washer should be fitted between the mirror and the wall (a tap washer is ideal), a nylon sleeve put in debt in the mirror, and a plastic screw cup placed under the screw head to protect the mirror.