Don't know about negative reviews. I bought this for my garage door to reduce stress on the hinges. Each door is made of wood and weighs 200 pounds. The hinges support everything, but I figured it would help prevent sagging. I pressed the spring in half and used some bolts with washers and nuts to attach it to the back of the door. For people complaining that they didn't come with clasps, you might want to start knitting. How will this company supply mounting hardware for each type of application? That would be waste and would increase the price. Buy a wheel, get $2 worth of nuts and bolts and you're done. Also, it's pretty hard work. I'm not sure if the spring is really good for 175 pounds but it was quite difficult to fully compress.
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