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[FAQ]

If a spring is scoped to a face and defined using the global cartesian coordinate system, updating the geometry will not affect the location of the spring. If you want the spring location to update when the geometry is updated, you need to define it using an associative coordinate system. (Help path: Mechanical User’s Guide > Setting Up Coordinate Systems > Creating Coordinate Systems > Establishing Origin for Associative and Non-Associative Coordinate Systems). For example, you can define the spring using a local coordinate system that was defined using a geometry face. If that face is modified and the geometry is refreshed, the spring will be modified accordingly.