I have had a Porter Cable 20V drill for 8 years and it has been a good one. It was not a cheap drill. Lately I have been so aggravated with the hand tightening chuck, it comes loose and whatever is in it........falls out. My attempts to get the chuck off had failed. It has a torx LH lock screw holding the main screw in. I broke one torx. I got some penetrating liquid spray and gave it a good spray.....then let it set thru lunch. I couldn't believe how easy it came off. After I got the chuck in my hand, I poured alcohol in all places where I could get it it, blew it out and repeated. I didn't think anything with oil should be used. I measure the thread so I could order a new half inch chuck with the proper thread. Today I installed the chuck and it works great, even to locking down too tight, requiring a lot of effort to loosen it. I suppose all those years and the dust that got in from drilling all kinds of material didn't allow it to fully tighten.

 This is my first experience with hand tightening chucks, Did I do it right? Any advise?

I have stripped one down and clean with rubbing alcohol. Still works good. But if that had failed either a new Chuck would have been next.

 

So I think you did a great job.

That screw is reverse threaded...