What is the purpose of dead coils in the middle of a compression

What purpose do dead coils in the middle of a spring serve? For example, this spring from a ballpoint pen has two dead coils at each end and two in the center of the spring. Why add dead coils in the

Active and Dead Coils of a Compression Spring

Compression Spring Parameters & Reference

Help me to understand TDC and cam lobes

Industrial Spring Corporation Compression Spring Technical

Gas springs in press applications – Tolerance balancing

SHOCK- 2021 All Coil Shocks (DHX2 and VAN models), Bike Help Center

Industrial Spring Corporation Compression Spring Technical Information - Industrial Spring Corporation

Solved A helical compression spring is made with

Active Coil - an overview

Solid Length - an overview

How do wave springs eliminate problems associated with coil springs