Sorry for digging up this old thread, but I wanted to say thank you. I recently started shooting (age 42!) and picked up a Ruger Mark III 22/45. Great gun. Finally decided to clean it and, well...you know the story. I ended up having several of the problems on the troubleshooting list, I wouldn't have been able to get it back together without them. Many thanks.
Now, next time I just have to manage to get the barrel off...