Hubbs is a good instructor and presenter. I noticed in the comment section to that vid that Blackie Thomas said the two-spring fix was his idea.
I have never owned a Colt Pocket but the word seems to be that they are the worst offenders for cap jams. Is that true? Shot a 49 on occasion and never had a problem, at least no worse than any other Colt repro. Rem pockets are much better for avoiding cap fall-off and jams. A family member has one so I get to use it sometimes.
I have a set of Brownells just like that. Man, I love those bits and driver.
Ive not filled the Colt safety notch but instead smoothed the edges well and that worked good for the Pietta Colts (.44 & .36). No. 10s in CCI or Remington on a Pietta cone stay put pretty well for me.