Author: jhoyla
Date: 2016-08-10 14:20
You ask a good question "how could this change overnight"?
I would suspect a bumper cork. Ordinary screws have no "play" in them, so the maker will put a thin layer of cork onto the surface under the screw. This damps the noisy clatter of the keys and also adds a little bit of play, making adjustment a little easier.
Perhaps the tiny sliver of cork under the screw that Chris described has fallen off? Take a look in your case, perhaps you can find it? A dab of contact adhesive (both surfaces, then wait) could be all you need.
J.
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