Dell Chromebook 11 CB1C13 Letter & Number Key Replacement

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Check the 4 metal clips that are attached to the palmrest. Look for damaged or missing clips.
If any of the 4 clips are missing, you will not be able to proceed and will have to replace the entire palmrest.
Check the condition of the rubber spring/membrane. If it is torn or missing, you will not be able to proceed and will have to replace the entire palmrest.
If any clips are bent, carefully use your tweezer to bend them back in their original upright position. (See video)

If the post are bend or broken you will have to replace the palm rest but the parts are available from https://www.replacementlaptopkeys.com/

Check the 4 main points of the key for damage.
Any damage in these areas will not allow the key to stay connected to the plastic bracket which sits underneath the key

While using tweezers, remove just the actually key (top layer only) . You want to try and remove the key without also removing the plastic bracket that sits right underneath the key.
Try to slightly pick at the corner of the key. This helps remove the key separately from the plastic bracket.

With tweezers, carefully start picking near the four corners where the 4 metal clips are securing the plastic bracket.

Line up the 2 outer corners and the bottom inner corners of the plastic bracket with the 4 metal clips connected to the palmrest.

Place the key on top of the plastic bracket and press down. If the plastic bracket is on correctly and securely, the key should easily snap into place.
Check if the key is secure by tapping around all sides of the key. This is a good test to make sure the metal clips are properly securing the plastic bracket and making sure that the plastic bracket can hold the key correctly.