You need to read the Peter Philpott book, The Art of Wrist Spin Bowling. There's series of chapters that take you through what he describes and going round the loop, but in essence he explains and suggests how you'd change your wrist position in stages to bowl all of the wrist spin variations. Having said that though there's no guarantee that despite knowing the theory you're going to have the dexterity or technique to execute all of them. Have a look at this video here as it may help... It's years old now and I could probably knock up a far better version, but in essence to get the Big Leg break sussed, you need to get the wrist right round so that you're almost trying to release the ball out of the back of the hand. For me there's a massive disparity between what I think I'm doing and what I actually do and in order to bowl these more extreme variations, I have to try and over do it e.g. try and bowl an Orthodox back-spinner in order that the ball comes out spinning at 90 degrees. What I then find is that because of the lack of control over the rotation of the seam, the ball rarely hits the seam and skids on to give you, what a lot of people call a 'Slider'. Of course it's not a 'slider' it's a Big Leg Break gone wrong see here
This here is the view the batsman would have of my 90 degree side-spinner
For me I just love short practice. Maybe once a delivery is mastered it's no longer necessary to work off a short distance but I don't think it does any harm. I just don't really see any other way to really develop a really good legbreak but to bowl not just hundreds, but thousands of deliveries and surely the best way to do that is have an empty net, a bucket of balls and bowl salvos off fifteen yards of so from one pace, and going for maximum spin not match delivery pace. This gives the freedom to experiment, become attuned to the ball and if you have the balls in a bag over your shoulder you can bowl fifteen balls a minute easily. From a full run up you are looking at two balls a minute, maybe three.
This here is the view the batsman would have of my 90 degree side-spinneras far as I'm concerned in my head, this is what I feel like I'm doing but I'm patently bot because the ball come out spinning side-ways rather than backwards. So what I try and do is spin backwards, but it come out sideways.
No you've missed the point. This is what I'm trying to do and intending on doing, but what actually happens is totally different, but in order for the ball to come out of the hand at 90 degrees, I have to run in with the intention that at the point of release I intend for my wrist to be like this, as I say, I doubt very much if it is.
You'd have thought that someone would have done so already. There is one bit of footage of Warne bowling a leg break, but it is just the one. I want to see the sub variations of the leg-break and all the classic variations. Even an intentional 'Slider' if he says he has one!!! It would be interesting to see what he comes up with. The technology is coming, I bought my son a Go-pro and he seems fairly convinced he can come up with something half decent with that because of the quality it shoots at, I'm not convinced, but he's insistent that it's up to it. When we get a nice day we'll give it a go.