Last night we worked on… wait for it… ARM DRAGS! What a useful skill to drill. Generally I don’t use them too much in my game. Why not? After working them from many different positions (including several that I’d never thought of), I see how useful they are. Quite often I use them from standing to start my attack. The arm drag to single leg or high crotch is a favorite of mine. I totally see the value of adding them to bottom half guard, 4 points, butterflies, and the list goes on.
While rolling, I saw so many opportunities to drag the arm and gain dominant position. Also, I could see myself being open to them and was able to defend against it more effectively. I can tell you this, I will start every position for a while by attempting some sort of arm drag. If I’m successful, great. If I’m not, I’ll move on. Thanks PJ!
Mountains to Mats 
Something I don’t use enough! Good luck with them.