Thanks everyone in this thread – chiming in here to say I also did this and it’s seemed to fix the issue! I did this for both my Tab and Esc key. As mentioned previously, please be careful and proceed at your own risk because the fragile/small plastic tabs can break. That being said, they don’t really latch under anything (as I had worried), but instead latch around, so as long as one pries (carefully) from the top and imho:
probably best from the middle top to apply even pressure and so both clips pop out at the same time,
the key should take negligible damage.
Here are some pics (EDIT: this is for my Batch 1 Standard US keyboard. I don’t know if other keyboards are the same, just a warning):
After popping off the top portion of the key, and flipping it down:
The inside of the Tab key with the Tab key flipped horizontally to the right:
Notice the clips at the top of the key, particularly how the two plastic tabs (in the yellow boxes) form a notch (where the blue arrows point to):
And for the scissor switch to click into:
Escape key is similar, just smaller (though when I first tried to flip it down it seemed stuck – I just wiggled it a little until I was able to):
How it looked after slightly bending the metal clips inwards:
The 440Hz tone generator is an excellent way to verify. When playing 440Hz at max volume, find the keys that rattle by holding them down with your finger, then fix rattle-y keys. There still seems to be some slight overall rattling of the case or underneath the keyboard (unsure), but I’ve been listening to music at full volume while typing this up, and there seems to now be no perceptible rattle. Also, I spent like an hour placing foam at various places underneath the keyboard, inside the laptop. It kinda worked, mostly didn’t. The fix mentioned above is wonderful with the added bonus that the keys aren’t as wobbly now when typing.
Many thanks again, cheers!