I have a model of a spring, variable pitch, using Pitch and Revolution. I am trying to configure it for different compressed lengths. I created a configuration for the compressed length, click on the Helix/Spiral in the feature manager, right click on one of the pitch values, click on Configure Feature, and change the value in the table. But the problem is it also changes the revolution value in the default configuration. Can't  see what I'm doing wrong.

Thanks Paul

Solidworks 2009

model attached