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It's very difficult to get non-technical people to understand even relatively simple directions on how to tune something. Did you ever have any non-technical person correctly and completely describe the symptoms of set with a visible failure? Probably not often. The symptoms of incorrect tuning are more subtle. If people can't find the words to describe what they see, it's only slightly less difficult for them to understand a description of what to look for. The tuning eye was a great idea for the masses who could not learn to discern the correct tuning point.
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