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As David states, in most cases you just put another quartz movement in but I know some of these watches are almost a cross between quartz and mechanical. I would seriously consider a book if you dont already have one before paying so much money for a course. Some of the early quartz watches are becoming quite collectable and I think in the future there could be some profit to be made from learning about them. I imagine the course would teach how to test for faulty components and how to replace them including the quartz crystals themselves. I dont honestly know how much work there is currently for quartz watch repair, it could be worth investigating!