One of my pet peeves on the internet is looking at YouTube videos about S&W revolvers with posters who know nothing about what they are talking about. If you have a free 90 minutes, grab your coffee and enjoy a retired, trained police armorer “Benny”, as he walks you through a very detailed disassembly of a N frame revolver. He actually spent some lengthy time learning from the people on the line at the factory in Springfield, MA. Don’t matter if yours is a K,L,J... they basically the same. Lots of tips on what problems to look for:https://m.youtube.com/watch?v=4ujyLn3lHBc