Rolling Guides, how to model ?

Goodday,

I'm trying to simulate different real projects in Kangaroo:

The Hobermann Dome for example:

http://en.wikipedia.org/wiki/Hoberman_sphere

The problem of this implementation lies in the modelling of the rolling guides at the bottom, the anchorpoints of the arch can move freely on the surface, in a line.

So i know there is a kangaroo function "pull to surf", but what I'm trying to say is that it would be usefull to have a "pull to line" to simulate rolling guides, as used in different mechanical principles.(driveshaft,etc)

How would you guys try to implement such a thing ? I tried defining 2 pull to surface (2 plane's, intersecting on the line), however this doesn't seem to get it right.

thanks in advance

PS: The meaning of the ghx is to turn off the simulation reset, and to shrink or enlarge the actuator (slider) underneath it to see it closing or opening. However the end points don't stay on the surface !