I guess its a modified keylock but im wondering if there is an exact name for it. I did this to someone yesterday and after I was kinda like wow what did I just do. Unlike the keylock you do this from the mount, I think it would be hard from sidemount. Kinda hard to describe the setup but that doesnt really matter so Ill just try to explain the finished position. Basically if you reached over your shoulder to scratch your back or shoulder blade that is the position the guy on bottom is on. Im sure there are different ways to do the grip and I dont know which is best yet since I kind of made it up on the spot, but what I did is used my outside hand (im attacking his left arm so my right hand) to grab his wrist and pin it against his shoulder, he has no power here so this is easy even on a big guy, you can kind of press your chest down on his elbow for even more help. Then I take my left forearm and cross it over my right forwarm kind of like if I were going to do an ezekial choke, and I start pushing my pushing down on his tricep/elbow with my left forearm while pulling down on his wrist with my right hand. Seems very similar too a keylock but the grips are different, and you cant do it from sidemount. Also its torqing the elbow not the shoulder. I know its sounds kinda hoopty but I did this on a purple belt and its the first time I ever tapped out a purple belt so I was so excited I forgot to ask him if he knew what it was called. I thought maybe a hammerlock but when I looked on bbj.org looks like that is syn. with keylock and americana. Please tell me no one has ever heard of it so I can call it the 'rerard elbow twist'