This was taken years ago at one of our early tech weekends.
http://www.youtube.com/watch?v=uzgHVjXZwoM
It still works today on all the tires that I have dis-mounted.
-Scorpion
-908
-K60
-TKC80
-Teraflex
It's good to have this in your bag of tricks out on the tail.
Like many have said. Practice at home, makes it easier on the trail.