I couldn't understand it at first, but it didn't last long. I tightened it on the first valve and it started to flex. I was angry because it felt light when I took it out of the box. I started reading the reviews and found other people who had bent theirs horribly. I thought I had been ripped off. Until my dad came by while I was tightening (and bending) the tool. He gently tapped the valve stem with a rubber mallet and the valve ripped out of its seat. So if your tool bends, you're misusing it. Once you've tightened it, tap it lightly to loosen the valve seat and it works great. I used it on a 98 Frontier (ka24de) head and it worked great. It didn't flex at all from the spring pressure (it only flexed with misuse)
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