ok for some reason i remembered this off million dollar baby but it seems to work good.
hit it with your good hand in a fist and hit the bag like normal then put all your weight onto your opposite foot liek you on 1 leg but got the other 1 there for balance and while doing this hit it with the bottom part of your fist. so the part where..ok just say you got your fist and its the side thats facing out.and hit it like on the movie an ice pick motionthen just do teh same thing with your other hand. its easier it might look so you should get it soon

satori