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Keith Berner of Accu-Force Dynos and Testers is an authority in Spring Know-How. In this important RaceKnowHow tech video Keith shows you how to figure your rate when using a double stack spring combination. Keith also explains why teams use a double stack setup and how it works on a car during travel. During the video Keith runs a double stack through a cycl on an Accu-force spring smasher to show you what happens on your car on the track. This is one piece of know-how you can’t miss!

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