Yep the "15 minute" trigger job isn't a bad option to clean up a stock trigger but it's no where close to a good trigger, neither is a Jewell in an AR unless you like readjusting them from time to time.
That's what locktite is for.
I had mine that had issues, as in not screws moving, but in 5 pulls in row, the weight coudl go up and down in pull weight on a scale.
The very first jewel I had, as it came on an experimental run from the factory for us to test did NOT do that.
I bought 3 a few years after that and Chris F was right, prettty much dumped em again as fast as I could once I put a pull gauge on em.