WARNING: I AM EXTREMELY INARTICULATE WHEN DESCRIBING STUFF.
So this being one of my favorite subs, and one that I want to excel at, so I figured instead of just doing shitloads of research and just me learnin, why not make a thread about it, I figure why not make a bunch of these with other submissions in the future, but for now I'm a just starting this one.
I like to do this mainly from two positions, one is when I'm in someones gaurd, I just lean back, break his gaurd open and fall back for an achillies, but instead of locking the ankle lock on, I twist to my side in the direction towards their other leg to position their leg right(For me,the twisting is one of the most vital parts in order to set this up, don't just yank the heel then turn, in my experience this makes it easier) , then twist only my body back abit, in which I trap the heel and lock it on.
the other one is when they mount me or have sloppy knee on belly.
for when i'm mounted, I just elbow escape one side, then kind do a little roll and back getting their leg for the heel hook, for the sloppy knee on belly, I like to grab the knee on me behind it, then do a little roll setting the heel hook position on then cranking it again.
Links for other info and stuff.
http://www.bjj.org/techniques/cesar/sub5/ (this is kinda like the one I'm describing above)
http://www.leglocks.com/new_page_1.htm (this has some stuff on it)
Guys just post more info, tips on how to make a heel hook better, more intricate details about it, all that stuff.