Fixing a loose keycap
If the keycap is loose but still attached to the laptop, it can often be fixed by pressing down on the keycap. If the keycap re-attaches, a snap while pressing the key down is heard. If this does not fix the issue, we suggest removing the key so it can be re-attached
Step 1: Pop Out the Key
Pop Out the Key

Use a flathead screwdriver to get the key out. Just get the tip of the screwdriver under the key and push down on the other side. With a bit of leverage, the key will pop right out.

Step 2: Get a Piece of a Straw
Get a Piece of a Straw

Cut off a little more than an inch of a clean plastic straw.

Step 3: Fold and Insert

Fold and Insert
Fold and Insert

Fold the straw in half lengthwise and insert it into the bottom of the key. It should now be sticking out quite a bit.

Step 4: Trim to Fit

Trim to Fit
Trim to Fit

Cut off the straw so that a few millimeters are sticking out. You now have an enhanced key that sticks out more and will be better at engaging the button inside the keyboard.

Step 5: Put Key Back in the Keyboard

Put Key Back in the Keyboard

On most keyboards, this is just a matter of placing the key in the right place and pushing down. You'll know when you get it right.

Test out the button and see if it's responsive now. If it's working, but it feels a little stiff, then pop the key back out, trim a tiny bit more of the straw off, and put it back in.

Done!