Parametric Spring with gradually reduced pitch at the ends (Fusion 360) 

Modeling a parametric spring with gradually reduced pitch at the ends.
This example gives much more possibilities than the integrated coil feature to model different kinds of realistic springs.
While this spring model is parametric with some flexibility for modifications, I don't use User Parameters. Instead, I try to make the most of implicit parameters created by Fusion 360 on sketches and features.