I have a problem controlling constraints thru configurations. I have two concentric cylinders that have have different thermal expansion coefficients.  I have configurations for each along with the assembly to represent everything at two different temperatures.  However I would like to constrain the cylinders together axially at a specific point along each cylinder.  This point should scale independently along each cylinder. Is there a way to do this?  I feel/fear that the only way to do this is to create a minute feature on each cylinder that can be mated to each other.  Any suggestions?