As well as belts, it should be cool if in MDX we could be able to make the solid part in order to give accuracy and beauty to our mechanism and without using the horrible default spring.
You have two options; use a regeneration step between positions (still motion) or find the tutorial on how to make springs dynamic by assembling semicircular "links". You can model the shock around it and constrain the spring assembly to it. A lot of work and CPU horsepower but should get you through an animation sequence.
not sure if l understand your question correct, but what about FLEXIBLE COMPONENT?
Hope it can helps...
Flexible components do not regenerate during mechanism analysis. They simply remain in the flexed position.
SolidWorks has the ability to do motion studies and will regenerate the models at each step in the analysis. To the best of my knowledge, Creo still cannot do this.
Here are some examples:
This is terrible, it seems that the only way to get the desire result is cheating.
Cheating in Creo to obtain something similar to Solidworks it has become in such an annoying habit. Creo 1-2-3-4 and the same things...