M2 flick. One fluid motion, just like a U2 flick. Flick with the ring finger, then follow through with your middle finger to do an M2. While doing the H Perm, the way you do it fast is as soon as you do the first M2 flick, you do a U flick immediately, then the next M2 immediately, then the U2 flick immediately, and so on, in one smooth alg. That's how people sub 1 it. I can, and you can too, just practice these fingertricks.