There are lots of things that can go wrong doing this and I refuse to accept any responsibility for what happens if you decide to do this. It probably voids your warranty, do it at your own risk. Do it over a surface in case you drop springs or little bits so you can find them again.
The only thing you really need is a screwdriver or other object to remove the c clip and a shim and a key you want to work in the cylinder. Search google for how to get a shim from a dvd package or something.
Next remove the c clip.
Put the key in. (You may be able to skip the next step depending on the cuts of your key.) This moves some little bits out of the way for your shim, slide the shim in between the housing and the little bits that moved out of the way.
When the shim is pushed all the way in there pull the plug out along with your key, it slides out very easily because of some ball bearings. Don’t let those fall out or if they do keep them to put back in later.
Now remove the two halves of the plug as seen in the video. The five sliding objects have to be lined up as in the video. Recombine the two halves and ensure that the smaller half slides back and forth. That means it worked. Now put it back together again and put it in the door.
If it malfunctioned before don’t trust it, it might malfunction again. You can remove malfunctioning sliders and replace them.