Restitution
This property determines the restitution of the two limits, or how elastic they are. The value defaults to 0 and can be any floating number in the range [0, 1].
This property only applies when UniversalConstraint.LimitsEnabled is set to true.
The elasticity affects the Attachment|Attachments connected by the UniversalConstraint when they reach the end of the range specified by UniversalConstraint/MaxAngle.