Display wobble at hinges

When I buy that preowned Air the previous user told me there was a problem withthe hinges because the display had got some (1-1.5cm) wobbling problem at the hinges side. As I double checked there is an extended warranty to that problem because of the Apple's announcement.

When the Hungarian official service partner changed the total display that referred problem has been gone but the few days ago I just realized the same not to friendly problem with the display :(

How can I fix that root cause for the next 100 years :)