The rodin coil is not easy to wind and it isn't wound how you would initially think it would be. I've posted something somewhere that has a link that explains how it is wound. I can't tell you how to wind the CONICAL WINDING, Peter knows.

That's why I posted my thoughts about the back/forth winding of normal coils wondering if that was counter-productive due to magnetic spin.
A toroid coil, be it normal or rodin windings does not have a back/forth winding.

The pdf Inquorate linked to can be found also at a UK website.
I've seen web pages where all words on the diagrams are readable at the web site. . link in this thread. Sorry I don't recall what words were used in the post to find it.