If you are just plain lazy you can download a 3D model for most of the MacMaster Carr range of springs.
I’ll give McMaster a go. Do you know how good McMaster Carr spring models are? The CAD spring I downloaded from someone else is incomplete: looks OK but is rigid and doesn’t behave like a spring when moved.
Possibly my approach is wrong and I need to emulate springs with a motor. Another unexplored SE feature!
Ta
Dave