Tornado Clock Choke

After recently rolling with someone who's gi was super tight I truly see the value in the tornado clock choke. I haven't had a chance to try this out yet but am looking forward to it. We were taught to hook the inside of the thigh/leg but I can see where sometimes that may not work. So, if hooking the thigh doesn't work and grabbing the gi pants doesn't work then I say go F5 tornado on them!!