Spring should be flexible when fix at one end and extend other end.

[devilal020795]

Spring should be realistic in this modelling environment after joining to a component  it should be have a flexible property as in realistic exists. It should change its property according its stiffness constant K value "Hooke's Law " 

[devilal020795]

There should be same for Rubber and Cloth. They should be Flexible also. And stiffness should be given to them..

[keqingsong]

Than you for your idea. Yes, it "should", but making that happen is a long way's out because the math + code to make this happen is a huge undertaking. We have higher priority projects we are working on at this time.