Sadly, the display frame in this series is weak, glueing won’t help. Take a look at this YouTube vid [https://www.youtube.com/watch?v=AUaJ8pDlxi8|The horrible truth about Apple's repeated engineering failures]
Time for a new lid assembly or a new system.
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=== Update (10/19/2018) ===
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Well, if you’re up to the challenge!
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Do you have access to a 3D printer? Taking your old one apart and using the needed CAD program for your printer map it out and test your creation! Once you’ve got it all worked out take your CAD drawing to a C&C miller and mill it out of good quality aluminum.
Sadly, the display frame in this series is weak, glueing won’t help. Take a look at this YouTube vid [https://www.youtube.com/watch?v=AUaJ8pDlxi8|The horrible truth about Apple's repeated engineering failures]
Time for a new lid assembly or a new system.