Something that is mentioned in few threads is to cut a compression spring down, this was a big no no while serving my apprenticeship as it leads to premature sagging due to stressing of the steel and bowing effect as the spring seat is no longer ground flat at the point of seating.
With this thought in mind it may be wise to locate a spring the correct free length/lb's for the vehicle weight or slightly shorter then add a spacer ring to the spring top seat to make up the short fall.
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