This may be old news to many on here, but I was having some trouble with my New Model Black hawk. On another Forum a guy gave me this Ruger link with a detailed video on the dis- assembly of the Black hawk. Thought I would pass it along.
http://www.ruger.com/products/newModelBlackhawkConvertible/extras.html
http://www.ruger.com/products/newModelBlackhawkConvertible/extras.html