Just watching this video quick for 5 minutes, I saw at LEAST 3 things you should never do in a shop. Starting with running the indicator the wrong way against the chuck, (he caught himself because after the initial turn he ran it the correct way), blowing out chips in a running machine to hitting the jaws with a file, please don't do what this guy does. At the least unsafe, up to just plain dumb. Forget about the mechanics, find another guy to watch on YouTube.
There is a reason that here is a ball on the indicator pickup just like there is a reason there should be at least one safe edge on a file used on a lathe. No-one deliberately touches the jaws but I would love to meet the person who hasn't. The only thing that I didn't like was filing right handed. The air, what's the problem?