Love to help, thinking about it now...  I am half figuring it out, seeing
pictures would be good, emailing them directly to me fine.  Be
warned I'm not a programmer by nature, but a mathematics person, 
so don't be surprised if I have no idea what a bspline is.

I think you don't want rotation in the z direction, as if the disk is created in
X-Y, then rotating it about Z, just rotates the circle, which is a symmetrical
object.  You want some y rotation instead.  If this isn't right I'll need some
more info.

I'm, thinking about it at the moment, I don't think the above would cause
that kind of a problem.

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