Since the Service Six is a double action revolver, this may be more helpful:
http://youtu.be/kkyRDM7md9A
And reassembly:
http://youtu.be/OiWkxSgi4IA
There are specific vids that show how to do the Service/Speed 6. Just do a search on YouTube. Here is a link to the manual that gives instructions:
https://ruger-docs.s3.amazonaws.com/...ecuritySix.pdf
Here's a vid that is for the Service 6:
http://youtu.be/96lc7XGZIxE