Hi Mike,

no, I've done that with many cylinders, using
1. transform/array/curve,
2. transform/array/dir and than
3. the boolean-difference-function.

I have no idea how the flow-function exactly works. It's always a try&error game for me to build a perfect tire like you described on your homepage http://www.k4icy.com/tutorials.html

By the way - a very helpful site ...

moritz