I've got a SolidWorks part that's being pig-headed.  It's a spring made from 3 helix features.  I'm trying to change the height, but everytime I change the parameter value, as soon as I hit the green checkmark, it changes back to the original height.  I don't see an equation governing this value, nor any other sort of "advanced modeling feature" (aka "land mine") in the model, but there must be something else driving the height of the helix.  Please, somebody take a look at this part and let me know where to choke it to get it to change.  Thanx.