I'm looking for details on using the overhook from half guard to control an opponent. Working on my entries to the rubber guard and really looking to nail down the details I'm missing with my overhook that is allowing my opponents to yank that arm free and then force me to start over. I am aware, the best answer is to go to the underhook and work my underhook game, but I am specifically limiting myself right now just to the overhook side of the game. Any video recomendations would be greatly appreciated.