How to make dynamic springs in solidworks?

How do you make springs go up and down in an assembly in solidworks?
On for example valve springs for an engine.

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Sudhir has made one, he also has a tutorial... i remember searching for a way to simulate spring motion, and i found his vid on youtube, way before i knew of grabcad :D there are other ways too but this is the only one that worked in a big assembly for some reason. Keep in mind though that you can only use 2 or 3 of such springs in an over all assembly. I tried putting 8 of them in my engine design and it froze solidworks :P
Spring

This is another way, ive tried it and it works fine for small assemblies

 
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