# File Springz.rb, line 184
        def Springz.set(o1,o2,strength=nil,distance=nil)
                spring = find(o1,o2)
                if spring
                        spring.strength=strength if strength
                        spring.distance=distance if distance
                else
                        spring = Springz.new(o1,o2,strength,distance)
                end
                spring
        end