There is a link to a video on the forum here someplace, but you can go "Google-up" S&W lock removal...or some such verbiage and find the video on you tube. I think that guy only removes the flag, but you will have to remove all 5-pieces to clear the hole and install the plug.

You can find other videos that take you through the general revolver tear-down out there on the web too if you have never gutted one.