Spiral Satining

I know how to do a standard satin, now how do you spiral satin?

To quote Elephark on the matter:

[quote=Elephark]Hold a yoyo half in one hand and sandpaper in the other hand. Then sand it like this:

http://yo-yo.org/elephark/modpix/satinangle.gif

You get this:

http://yo-yo.org/elephark/modpix/gadgtankprofile.jpg

http://yo-yo.org/elephark/modpix/gadgtankspin.jpg
[/quote]

Basically satining at an angle.