This spring can be used for both learning and tooling around.
It is fully adjustable:
Used in the creation of the following wiki article: JBeam_Physics_Theory
The game might not show your spring adjustments in the menu when you click apply, they should however still be applied correctly to the mod, it's just a BeamNG UI glitch.
In the upcoming days mod approvals could be slower than normal.
Thank you for your patience.
A spring with configurable settings.