Christopher,
If you are looking to add dynamic, real-time flexibility to your spring part that will not work. Therre are at least a few ways to have it change with a regeneration or to make it flexible. I've attached a couple ideas from the free PTC Learning Exchange.
http://learningexchange.ptc.com/tutorial/1609/adding-flexibility-to-already-placed-components
Hope this helps.
Regards,
Adam