Helper spring is needed if main spring preload is zero or less.
Round wire shape helper springs come with a adapter. The Adapter is designed bottom before the helper spring goes coil bound. This prevents the helper to get damaged. Helper spring packages are designed to be used with 60 and 75mm main springs.
Our helper spring packages are designed to last under constant load. Springs are made of high quality spring wire and electro zinc plated against corrosion.