Hurst is quite famous for writing a book. It's called The Profit Magic of Stock Transaction Timing, by J M Hurst. It's available from Global Investor, etc.

I have the book, and it's quite mathematical but it does give you all the details for working out cycles. From memory, it's not very expensive, so perhaps you may wish to read the book before you subscribe to the service. It was first published in 1970, so is quite an old-fashioned book, if you know what I mean.