If you need a simple springy thing, this is it :-)

Change the below values in the .scad file to your needs.

ScrewHoleDistance = 30;
springAmplitude = 10;
spirngHeight = 1.5;
springThreadWidth = 1.5;
springPhaseCount = 6;
springScrewHoleDiameter = 2.2;
mountDist = 2.0;