I want to mate a spring between the two faces that compress it ?
To mate the ends of the spring, create planes at the ends (if not already there) then use the planes to mate. If you want the spring to compress you might find this video useful SolidWorks - How to model a Dynamic Spring - YouTube
You can use this spring, adjust the dimensions to suit your needs. Mate the origin to a fixed plate, then using Sketch1 in the Sweep1 feature mate the upper end point to the moving plate/face.
Thankyou, I have saved the spring will come in handy
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