I had the same problem, tried the spacers, you have to stretch spring between two posts with a come-a-long then put in spacers and so on. Very, very hard to get spacers out with hood mostly closed. Saw the same video Red58 posted and a few other ideas, What I did, that worked, was hook the top of spring to hood hook, attach the end link of a chain to bottom of spring, run chain down under cross member or ?, then to another truck. Back other truck up until most of the sag is gone but still some sag. Step on chain to stretch spring while leaning over to guide it onto other hood hook. (May need a crow bar or lever to swing it sideways and onto hook). You can control the stretch very easily. Once hooked, cut off the link that is trapped with an angle grinder. This was 1. safe, 2. hands free,one person, 3. easy, nothing to build or buy 4.may need to partially close hood during and use a prop rod to keep hood from closing during. 5.wear goggles or face shield anyway. Don't know what truck you have? There are no pliers that will stretch a hood spring. Vice grips may loose their "Grip".
