Fixing my Dewalt Driver Chuck

I had two Dewalt impact drivers with the same chuck problem. The bits kept falling out. When the first one failed, I used the second one. When the second one failed, I decided to solve the problem. The first one fixed so easily, I decided to film fixing the second.
Most of you were probably hoping for another construction timelapse... I'm working on that. This is just a side feature.
If you came looking for the fix, you may be interested in some of the other videos about building my earth sheltered home, so I included a link to my playlist. ;^)