FYI - 'Thin Series' iMac hinge issue admitted to by Apple!
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I've seen over eight of these hinge failures! The issue is a defect in the design! Apple is now admitting to the problem.
If you get one in I recommend the customer bring it to an Apple Store or Authorized Service Center and it should be done for free!
[http://www.macrumors.com/2016/11/29/imac-broken-hinge-refunds-repair-program/|Apple Offering Refunds to Customers Who Paid for iMac Hinge Repairs]