As an alternate to mod 7, for those who have or want to drill out their regulator housing, and still want to lower their valve spring tension; this mod is for you. I've designed a series of inserts that can be stacked on top of each other or used separately to adjust the valve spring tension. Each insert has a lip on it to act as a spring guide to keep it centered.
Product Availability
The Mad Marty's Spring Adjustment Inserts are older, so while they may be available used and in a few cases new, they are not commonly available anymore.
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