>  So, my questions is, which way does the smaller wheel have to move to
>  speed up and which to slow down??. Towards the center of the big disk -
>  or away from the big disk.
>
>  Has anyone ever seen such a thing? How would you clutch it to disengage
>  it altogether.- put it in an idle mode?

Faster would be towards the edge, slower towards the center.It's
easier to visualize if you imagine the big disk is standing still and
the little wheel is running around it in a circle. If it runs around
the circle in a given amount of time, it would logically have to run
faster the bigger the circle it's running. I can't say how it
disengages specifically, but similar devices I've seen have a "ramp"
at the end of the sliding track along which the small wheel moves
during speed adjustment. This "ramp" pulls the wheel away from the
disk as it reaches the center of disk.

--
John Bange
'90 Vanagon - "Geldsauger"
'90 Vanagon GL - "Wiesel"