Until a couple years ago, Harken would replace any broken block, no questions asked, with a new one. If you are having a problem with any Harken equipment, you should talk to them about it and discover for yourself how responsive they are. We had problems this spring with the new carbo mainsheet blocks that came on the Mystere 4.3s that we bought. I let Harken know about the problems and they were all over it - the response they provided is the kind you dream of and wish every vendor would exhibit. They provide equipment to the highest levels of the sport and we get the benefit all the way down to an inexpensive little 14 footer! They were just chosen by the marine industry this year for a prestigious vendor award. They are constantly innovating new and useful gear and have a presence around the world. These are some of the reasons that manufacturers choose them and that sailors like me are happy they do. While I have had a few failures with their equipment over the years, they have always been corrected at no cost to me by Harken. Contact them about your problems and learn for yourself what their customer service is like. Their catalog even has photos of their employees so you can look at who you are dealing with over the phone. <br><br>