So I have been helping a friend convert to a high lift. I have installed and worked on hundreds of doors but never a high lift. My question is about springs. I tried regular springs and obviously they did not work. I have done some calculations and it looks like I need 2 .289x74.5in. springs. Does that sound right? I mean the length because I just dont want to order springs and pay all that money and not have them right. Thanks in advance.
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