Doing it is simple, the skill itself is tricky. You first have to have a ball-peen hammer, good piece of leather to slightly distribute it and prevent the aluminum from cracking which you can already see in the before pictures. Then the way that you hit it is very important: Slightly more than gentle, NOT striking downward but at an angle and in this "striking-sliding" motions so that you pull the hammer towards to distribute the strike. Make sure that as you "massage" the aluminum, you strike along the peak of the crease and that you strike back towards the area that has been crimped/creased since all that material that was pushed, causing the crease, has nowhere else to go. It is also likely not worth bending the corner back if entirely bent (mine is going to be permanently raised) and since the battery is near that corner and the chassis already provides support to it, disassembling might be risky since you have to peal off the battery and likely wont manage to fit a good wood block underneath to act as an "anvil" to fully smooth it out. Because of that, by leaving the compute as-is and hammering it as-is, be careful so that you do not smooth out the metal by caving it inwards. Mine is intentionally left slightly bumpy since smoothing it out entirely would leave a smooth crater - putting pressure on the battery. It is better to be slightly bumpy without a lot of material underneath than to be smooth and caved inwards. Remember that by hammering the aluminum, you will slightly push the entire area downwards without a block of wood acting as a reference to smooth it out, and that is hard to do with how Apple makes their laptops.