Contact Ruger, They can walk you thru this. I've got a MarkII and have messed with guns my whole life. That being said, I won't try to tear down that pistol again! It's like a Rubic's Cube. Ya know how it's supposed to go back but for some reason it just don't work! I've never been able to get the barrel off to adjust the trigger,even though it tells ya right there in the instructions. A gunshop right next to where I live charged $20 dollars to put these things back together. I know this because I paid it the first time. The last time, I'd mess with it for a while,get pissed,lay it down and come back later. It finally went back correctly and I was happy. It has been back apart since!
HWD
HWD