Because my children kept banging my MacBook on tables, the underside has come loose. At first I thought I'd have to go to the Apple Store for a solution, but I didn't want to pay a hefty fee. Just a couple of google searches showed I needed screws and there were more than enough. Enough screws in case the problem comes up again and they are ridiculously easy to screw in which saved me a lot of money and wasted time.
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