Probably one of the better videos I’ve seen on this.
When I bought mine about a million years ago the first thing I did when I got it home was to tear it down and when I say tear it down, I did a nasty on it, just like a 1911. I took it completely apart – bolt, trigger, everything. If it came out or apart, I took it out or apart. I managed to get it all back together but the damned bolt wouldn’t cycle all the way back so I ended up taking the damned thing back to the shop in pieces, in a box, where I promptly got laughed at and received my official membership into the Frustrated Ruger Owner’s Club. There’s approximately 14,000,000 members in it from what I hear.
It’s all about that damned hammer strut – it’s gotta fall in the right spot when you’re locking everything down or your bolt will come back halfway and stop. I still have to backtrack at least once to get it right even after all these years.
Anyways, here’s a video that’s focused with good lighting to show you how to do it.