I've become very interested in support spindles. PickleSue, a/k/a PickleSoup on Ravelry, is the one who got me really interested in them. And on Ravelry there are lots of very experienced support spindlers.
Well, Susan, a/k/a fleegle on Ravelry, is creating a book, Fleegle Spins Supported, if you are interested in learning how to use a support spindle and would like to purchase Susan's book, please go to Fleegle Spins Supported and add to faves. This will give Susan numbers so she will know how many books to have printed. Once she has these figures, she will know how much she needs to charge for here book.