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When we had our farm in the early 70s the only time we didn't repair something ourselves was when we didn't have the right wrench. We also didn't need all the electronics so many companies and farmers think they need to plow, plant cultivate or harvest. Who needs a GPS to tell them where they are in the field? Who needs all electronic gimcrackery on the engines that are running at a constant RPM 90% of the time? I had no mechanical training yet I could set up our combine or tune my car just by looking at the manual.