Here Steve Koepfer founder of the American Sambo Association demonstrates how to cinch up and finish the foot lock.
There are a few details that Steve covers in this video that are going to make your technique TIGHT !
The first one is the way that he snatches the foot. He remains loose but in control of the leg so that he can explode down the shin to the ankle. This movement alone could have people tapping.
Steve also covers how to draw your shoulder back and down once you have the ankle. This is another little detail that is going make your footlock super tight.