I learned the centre tear from Richard Osterlind a while back and have been performing it ever since, until I found a slightly different variation by Rick Lax which I liked very much. I came across Shredder by Spidey and was wondering what the key differences are, I feel like they're not going to be much difference. That is why I'm hesitant. Also is Sneak Peek by Spidey practical and is it something new?